- Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

Workshop Montreal - Hyperbolic manifolds in dimensions 4 (and more)
by Bruno Martelli 09 Jun '25

09 Jun '25

Buondì, Segnalo il workshop "Hyperbolic manifolds in dimensions 4 (and more)" https://www.crmath.ca/en/activities/#/type/activity/id/4016 Mi dicono gli organizzatori che hanno fondi disponibili per i partecipanti. A presto, Bruno

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Seminario di Geometria Martedì 10 Giugno 2025 - Pietro Capovilla
by Filippo Sarti 09 Jun '25

09 Jun '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Pietro Capovilla e si terrà Martedì 10 Giugno alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Combination theorems for open covers Abstract: The generalized Lusternik-Schnirelmann category of a space is the minimal cardinality of open covers by subsets whose fundamental group is contained in a given family of groups. The goal of this talk is to present a combination theorem for generalized LS-categories of groups G in terms of the stabilizers of contractible CW-complex equipped with an action by G. This fact has applications to the geometric dimensions of groups and to the simplicial volume of manifolds obtained by gluing. A presto, Carlo e Filippo

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Fwd: [gdrtresses] IHP programme: Illustration as a mathematical research technique
by Bruno Martelli 08 Jun '25

08 Jun '25

---------- Forwarded message --------- Da: s.schleimer(a)warwick.ac.uk <s.schleimer(a)warwick.ac.uk> Date: Sab 7 Giu 2025, 21:42 Subject: [gdrtresses] IHP programme: Illustration as a mathematical research technique To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> Dear colleagues, From January 5 to April 3, 2026 the Institut Henri Poincareì (Paris, France) will host a research trimester entitled 'Illustration as a mathematical research technique'. This includes an introductory graduate school at CIRM (separate registration required), a mathematical art exhibition (submissions now open), and three workshop weeks focussing on number theory, on geometry/ topology, and on rigorous illustration. There will also be a student apprenticeship program (more info soon). Below is a fuller description of the program. Registration for the program and the conferences is still open: https://indico.math.cnrs.fr/event/13123/ Registration is free but mandatory, and financial support is available. Some funding is earmarked for graduate students and early-career researchers. The deadline to apply for financial support is June 15, 2025. The organizing committee David Bachman (Pitzer College) Reìmi Coulon (CNRS / Universiteì de Bourgogne) Gabriel Dorfsman-Hopkins (St. Lawrence University) Edmund Harriss (University of Arkansas) Martin Skrodzki (TU Delft) Katherine E. Stange (University of Colorado Boulder) Glen Whitney (Studio infinity) ---- Mathematical understanding is built in many ways. Among these, illustration has been a companion and tool to research for as long as research has taken place. We use the term illustration to encompass any of the many ways one might bring a mathematical idea into physical form or experience, including computer visualization, 3D printing, and virtual reality, among others. With modern tools, illustration can even make mathematics an experimental science, so that computational results can drive the cycle of problem, conjecture, and proof. Today, modern technology for the first time places the production of far more complicated 3D models within the reach of many individual mathematicians. Moreover, the very process of illustration itself challenges our understanding of a mathematical topic and forces us to answer questions we may not have posed otherwise. This trimester program will bring together mathematicians using illustration as a research tool with mathematicians newly learning these tools. The group will be comprised of members from various areas of mathematics. The mains goals of the trimester are: - advancing research through the use of mathematical illustration; - disseminating the skills for the creation of mathematical illustration and its use in research; - furthering the theory of illustration as a tool. Program highlights include: - January 5 to 9, 2026: Opening Graduate school at the CIRM (a separate registration is needed at https://conferences.cirm-math.fr/3491.html) - January 19 to 23, 2026: Workshop 'Rigorous Illustrations - Their creation and evaluation for mathematical research' - February 16 to 20, 2026: Conference 'Bridging visualization and understanding in Geometry and Topology' - March 23 to 27, 2026: Conference 'Integrating Research and Illustration in Number Theory' - April 9 to July 25, 2026: Group exhibition 'Mathematics and Art in Creation'. Projects can be submitted here https://sondages.ihp.fr/index.php/559142?lang=en Review of applications will begin July 1st, 2025 and will then continue on a rolling-basis.

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Seminario di Geometria Martedì 29 Aprile 2025 - Jacopo Guoyi Chen
by Filippo Sarti 28 Apr '25

28 Apr '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Jacopo Guoyi Chen e si terrà Martedì 29 Aprile alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Non-cobordant hyperbolic manifolds Abstract: In all dimensions n ≥ 4 not of the form 4m+3, we show that there exists a closed hyperbolic n-manifold which is not the boundary of a compact (n+1)-manifold. The proof relies on the relationship between the cobordism class and the fixed point set of an involution on the manifold, together with a geodesic embedding of Kolpakov, Reid and Slavich. We also outline a possible approach to cover the dimensions 4m+3 ≠ 2^k−1. A presto, Carlo e Filippo

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Research position in Geometry at Bilbao
by Bruno Martelli 16 Apr '25

16 Apr '25

Hi, The University of the Basque Country is looking for a competitive experienced candidate for a research-only job in Bilbao (Spain). Here are some details about the position: - The position is a permanent research job with NO teaching requirements - The area is (differential) geometry (any interested candidate working with manifolds is encouraged to contact us) - The candidate should have at least 8 years of experience after obtaining the PhD - The candidate should speak english. No knowledge of spanish or basque is required. - The deadline for applications is the 15th of June. Interested candidates can contact by e-mail Ilya KAZACHKOV <ilya.kazachkov(a)ehu.eus> Best regards, Dario Ascari

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Summer School "Enumerative Geometry and Geometric Representation Theory" - 23 Giugno - 4 Luglio - Pisa
by Francesco Sala 05 Apr '25

05 Apr '25

Carissime/i, sono lieto di informarvi del seguente evento che avrà luogo a Pisa. Se interessati, vi prego di registrarvi. --- Summer School "Enumerative Geometry and Geometric Representation Theory" June 23, 2025 – July 4, 2025 https://events.dm.unipi.it/e/summer_school_2025 The Summer School will focus on the following main subjects: - logarithmic and tropical geometry and relations to enumerative geometry - the geometry of the Hitchin moduli space - Donaldson-Thomas invariants, BPS states, and their categorification - Cohomological Hall algebras and their relation to enumerative geometry - Coulomb branches in geometry and representation theory The school will offer six 5-hour lectures together with exercise/Q&A sessions and Advanced Research sessions. The school welcomes everybody but is primarily intended for Ph.D. students and young postdocs. --- Lecturers - Pierrick Bousseau (University of Georgia, USA, and CNRS, France) - Joel Kamnitzer (McGill University, Montreal, Canada) - Olivier Schiffmann (CNRS and Université de Paris-Saclay, France) - Junliang Shen (Yale University, USA) - Bernd Siebert (The University of Texas at Austin, USA) - Yukinobu Toda (Kavli IPMU, the University of Tokyo, Japan) Advisors for the Afternoon Sessions - Hülya Argüz (University of Georgia, USA) - Camilla Felisetti (Università di Modena e Reggio Emilia) - Lucien Hennecart (University of Edinburgh, UK) - Samuel Johnston (Imperial College London, UK) - Dinakar Muthiah (University of Glasgow, UK) - Tudor Pădurariu (CNRS and Sorbonne Université, France) Scientific Committee - Andrei Neguţ (EPFL, Switzerland) - Francesco Sala (Università di Pisa) - Olivier Schiffmann (CNRS and Université de Paris-Saclay, France) - Mattia Talpo (Università di Pisa) Organizing Committee - Andrea Maffei (Università di Pisa) - Francesco Sala (Università di Pisa) - Mattia Talpo (Università di Pisa) --- Francesco

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Seminario di Geometria Martedì 8 Aprile 2025 - Marco Marengon
by Carlo Collari 03 Apr '25

03 Apr '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Marco Marengon e si terrà Martedì 8 Aprile alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Splitting links by integer homology spheres Abstract: We show that there exist two embedded 2-spheres in the 4-sphere which are separated by an integer homology 3-sphere Y (i.e., a manifold with the same integer homology of the 3-sphere), but not by the standard 3-sphere. This is joint work with Marco Golla. A presto, Carlo e Filippo

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Conferenza "Knots and Proteins" a Bologna
by Filippo Sarti 20 Mar '25

20 Mar '25

Cari colleghi, vi segnalo la conferenza <https://eventi.unibo.it/knotsprotein> Knots and Proteins<https://eventi.unibo.it/knotsprotein> che si terrà a Bologna il 19 e 20 Maggio. E' possibile registrarsi alla pagina<https://eventi.unibo.it/knotsprotein/registration-form> e, entro il 15 Aprile, proporre un talk. Saluti, Filippo

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Seminario di Geometria Martedì 18 Marzo - Alessia Cattabriga
by Filippo Sarti 17 Mar '25

17 Mar '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Alessia Cattabriga e si terrà Martedì 18 Marzo alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con la speaker, l'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Rappresentazioni "plat-like" di link in 3-varietà orientabili Abstract: Dopo una breve panoramica delle diverse tecniche di rappresentazione di link in 3-varietà orientabili, mi focalizzerò su rappresentazioni che utilizzano gruppi treccia e chiusura "plat-like". In particolare, presenterò: - risultati consolidati ottenuti in collaborazione con Paolo Cavicchioli per link in varietà di Dunwoody e Takahashi presentate attraverso decomposizioni di Heegaard - risultati iniziali relativi ad un lavoro che, oltre a Paolo Cavicchioli, coinvolge Mishra Rama e Visakh Narayanan, riguardanti varietà che ammettono decomposizioni one-sided (cioè contengono una superfice non-orientabile il cui complementare è un corpo di manici). A presto, Carlo e Filippo

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Seminario di Geometria Giovedì 6 Marzo - Ilaria Castellano
by Filippo Sarti 03 Mar '25

03 Mar '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Ilaria Castellano e si terrà Giovedì 6 Marzo alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con la speaker, l'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Totally disconnected locally compact groups, accessibility and Euler-Poincaré characteristic Abstract: In the first part of the talk I will illustrate how the classical notion of accessibility for finitely generated groups carries over to the realm of compactly generated totally disconnected locally compact (= t.d.l.c.) groups. Then, by means of a new notion of Euler-Poincaré characteristic, I will discuss an accessibility result in the t.d.l.c. framework, under the assumption of rational discrete cohomological dimension = 1. A presto, Carlo e Filippo

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Seminari di Geometria Mercoledì 26 e Giovedì 27 Febbraio
by Carlo Collari 25 Feb '25

25 Feb '25

Buongiorno, Vi ricordo che questa settimana ci sarà un doppio appuntamento del seminario di Geometria e Topologia. Oltre al seminario di Giovedì 27 Febbraio, che sarà tenuto da Daniele Angella alle ore 14:30 presso l'aula Riunioni, avremo un ulteriore appuntamento Domani Mercoledì 26 Febbraio, questo seminario sarà tenuto da Fabrizio Bianchi alle ore 16:00 presso l'aula Seminari. Per gli interessati ad andare a pranzo con la speaker, l'appuntamento è in atrio alle 13:00. Allego titoli e abstract A presto, Carlo e Filippo Seminario del 26 Febbraio Relatore: Fabrizio Bianchi Titolo: On entropy of holomorphic maps Abstract: A celebrated theorem by Gromov (70s, published in Enseign. Math. 2003) states that the topological entropy of a holomorphic self-map of a Kahler manifold is bounded above by the logarithm of the maximum of the dynamical degrees. The proof relies on a geometric interpretation of the entropy and on a volume estimate for complex analytic sets. I will provide some context for this result and present the main ideas of this proof in the case of rational maps of the Riemann Sphere (where the upper bound reduces to the logarithm of the degree). Seminario del 27 Febbraio Relatore: Daniele Angella Titolo: The Hermitian geometry of Chern connections Abstract: We consider some analytic problems concerning the geometry of the Chern connection of Hermitian manifolds, e.g. the existence of metrics with constant Chern-scalar curvature; the generalizations of the Kähler-Einstein condition to the non-Kähler setting; the convergence of the normalized Chern-Ricci flow on compact complex surfaces. The talk is based on joint collaborations with Simone Calamai, Mauricio Correa, Francesco Pediconi, Cristiano Spotti, Valentino Tosatti and others.

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Corso 4-varietà + Teorema di Gromov
by Bruno Martelli 25 Feb '25

25 Feb '25

Cari, Segnalo un paio di eventi che ci saranno fra pochi giorni in dipartimento che secondo me sono particolarmente utili per chi fa geometria e topologia. Mercoledì alle 16 in Aula seminari Fabrizio Bianchi ci illustrerà un teorema di Gromov sull'entropia di mappe olomorfe. Si tratta di un argomento molto bello e fortemente collegato alle mappe pseudo-Anosov su superfici e al seminario di Elia che c'è stato qualche settimana fa (l'idea di chiedere a Fabrizio di illustrarci il teorema è venuta dopo il seminario di Elia). Lunedì prossimo alle 16 su google meet ci sarà la riunione preliminare del corso di dottorato "4- manifolds", tenuto da Marco Marengon. Il link è https://meet.google.com/pvo-musz-gfz A presto, Bruno

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Conference “Leaning towards higher rank”, April 28- May 2, Pisa
by Andrea Tamburelli 20 Feb '25

20 Feb '25

Dear colleague, Francesco Bonsante, Christian El Emam and I are organizing a small conference in Pisa from April 28th to May 2nd, on the general theme of hyperbolic geometry and classical and higher Teichmüller theory. We would appreciate if you could advertise it to people in your group that may be interested. More information is available in the conference webpage (https://pagine.dm.unipi.it/~a019210/Conference25.html) With kind regards, Andrea

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Seminario di Geometria Giovedì 20 Febbraio - Nicoletta Tardini
by Carlo Collari 17 Feb '25

17 Feb '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Nicoletta Tardini e si terrà Giovedì 20 Febbraio alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con la speaker, l'appuntamento è in atrio alle 13:00. Allego titolo e abstract Titolo: Special Hermitian metrics on complex manifolds Abstract: Kähler geometry lies at the intersection of complex geometry, Riemannian geometry and symplectic geometry. From the complex geometric point of view it is therefore natural to consider special non-Kähler Hermitian metrics on complex manifolds. Among them, pluriclosed metrics deserve particular attention. These metrics always exist on compact complex surfaces but the situation in higher dimension is very different. We will discuss several properties concerning these metrics also in relation with the Bismut connection having Kähler-like curvature. This is joint work with G. Barbaro and F. Pediconi A presto, Carlo e Filippo

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Workshop "Manifolds and Groups in Bologna, III", announcement
by Filippo Sarti 06 Feb '25

06 Feb '25

Dear all, we are pleased to announce the workshop Manifolds and Groups in Bologna, III ----------------------------------------- Date: Monday, Apr 14, 2025 -- Wednesday , Apr 16, 2025 Place: University of Bologna The aim of this workshop is to bring together young researchers working in low-dimensional topology and geometric group theory in a broad sense. The event consists of main lectures and shorter talks in order to give the opportunity to young researchers to present their own research. Main speakers: Naomi Andrew (Oxford), Macarena Arenas (Cambridge), Carlo Collari (Pisa), James Farre (MPI MIS Leipzig), Mitul Islam (MPI MIS Leipzig), Stavroula Makri (Toulouse), Lorenzo Ruffoni (Binghamton), Matthias Uschold (Regensburg). Junior speakers: Sofia Amontova (Geneva), Valentina Bais (SISSA), Filippo Bianchi (Pisa), Elena Bogliolo (Pisa), Alberto Casali (Pisa), Bruno Dular (Luxembourg), Franziska Hofmann (Regensburg). https://math.unibo.it/en/events/manifolds-and-groups-in-bologna-2025 Looking forward to seeing you in Bologna, Giuseppe Bargagnati, Marco Moraschini, Stefano Riolo (University di Bologna) and Filippo Sarti (University of Pisa)

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seminario di lettura
by Paolo Lisca 05 Feb '25

05 Feb '25

Ciao a tutti, vorrei organizzare un seminario di lettura su questo articolo<https://arxiv.org/abs/2402.10452>, che fornisce la prima dimostrazione dell'esistenza di 4-varietà esotiche compatte orientabili senza l'uso di analisi. Ci sarà un incontro preliminare martedì 11 febbraio alle 14:30 nella saletta seminari. Chi non può (ma vorrebbe) venire martedì mi avverta! A presto, Paolo

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Seminario di Geometria Giovedì 6 Febbraio - Michelle Bucher
by Carlo Collari 03 Feb '25

03 Feb '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Michelle Bucher e si terrà Giovedì 6 Febbraio alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con la speaker, l'appuntamento è in atrio alle 13:00. Allego titolo e abstract Titolo: Continuous cocycles on the Furstenberg boundary and applications to bounded cohomology Abstract: Group cohomology comes in many variations. The standard Eilenberg-MacLane group cohomology is the cohomology of the cocomplex {f:Gq+1→R∣f is G−invariant}{f:Gq+1→R∣f is G−invariant} endowed with its natural homogeneous coboundary operator. Now whenever a property P of such cochains is preserved under the coboundary one can obtain the corresponding P-group cohomology. P could be: continuous, measurable, L0L0, bounded, alternating, etc. Sometimes these various cohomology groups are known to differ (eg P=empty and P=continuous for most topological groups), in other cases they are isomorphic (eg P=empty and P=alternating (easy), P=continuous and P=L0L0 (a highly nontrivial result by Austin and Moore valid for locally compact second countable groups)). In 2006, Monod conjectured that for semisimple connected, finite center, Lie groups of noncompact type, the natural forgetful functor induces an isomorphism between continuous bounded cohomology and continuous cohomology (which is typically very wrong for discrete groups). I will focus here on the injectivity and show its validity in several new cases including isometry groups of hyperbolic nn-spaces in degree 4, known previously only for n=2n=2 by a tour de force due to Hartnick and Ott. Monod recently proved that all such continuous (bounded) cohomology classes can be represented by measurable (bounded) cocycles on the Furstenberg boundary. Our main result is that these cocycles can be chosen to be continuous on a subset of full measure. In the real hyperbolic case, this subset of full measure is the set of distinct tuples of points, easily leading to the injectivity in degree 4. This is joint work with Alessio Savini. A presto, Carlo e Filippo

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Seminario di Geometria 30 Gennaio - Elia Fioravanti
by Carlo Collari 27 Jan '25

27 Jan '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Elia Fioravanti e si terrà Giovedì 30 Gennaio alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 13:00. Allego titolo e abstract Titolo: Growth of automorphisms of special groups Abstract: Given a (nice) group G, we are interested in how fast the length of a group element can grow when we apply powers of a given outer automorphism of G. If the group G is free or the fundamental group of a closed surface, classical train-track techniques give a complete and precise picture. This can be extended to automorphisms of all negatively curved (a.k.a. Gromov hyperbolic) groups G, using Rips-Sela theory and the canonical JSJ decomposition. Very little seems to be known beyond this setting. We study this problem for a broad class of non-positively curved groups: "virtually special" groups in the Haglund-Wise sense. In this setting, we prove that: (1) the stretch factor of any automorphism is an algebraic integer; (2) if the automorphism is untwisted, then it admits only finitely many growth rates, each of these is polynomial-times-exponential, and there is a Nielsen-Thurston decomposition. A presto, Carlo e Filippo

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Seminario di Geometria 23 Gennaio - Macarena Arenas
by Carlo Collari 20 Jan '25

20 Jan '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Macarena Arenas e si terrà Giovedì 23 Gennaio alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con la speaker, l'appuntamento è in atrio alle 13:00. Allego titolo e abstract Titolo: Taut smoothings and shortest geodesics Abstract: In this talk we will discuss the connection between combinatorial properties of minimally self-intersecting curves on a surface S and the geometric behaviour of geodesics on S when S is endowed with a Riemannian metric. In particular, we will explain the interplay between a smoothing, which is a type of surgery on a curve that resolves a self-intersection, and k-systoles, which are shortest geodesics having at least k self-intersections, and we will present some results that partially elucidate this interplay. A presto, Carlo e Filippo

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Seminario di Geometria 16 Gennaio - Francesco Bonsante
by Carlo Collari 13 Jan '25

13 Jan '25

Buongiorno, Ricominciano i seminari di Geometria e Topologia! Il primo seminario di quest'anno sarà tenuto da Francesco Bonsante e si terrà Giovedì 16 Gennaio alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 13:00. Allego titolo e abstract: Titolo: Rigidità di circle packings su superfici proiettive Abstact: I circle packing su superfici iperboliche (o più in generale su superfici Riemanniane a curvatura costante) sono collezioni di dischi mutualmente tangenti, tali che il complementare dell’unione di tali dischi sia un’unione disgiunta di interstizi triangolari. Essi sono stati inizialmente studiati da Thurston che ne ha dimostrato un importante risultato di rigidità: fissata la combinatoria della collezione dei dischi esiste un un’unica superficie iperbolica su cui il circle packing può essere realizzato. Più recentemente Kojima Mitzushima e S.Tan hanno osservato che la nozione di disco su CP1 e invariante per trasformazioni proiettive e dunque ha senso parlare di dischi e di circle packing su superfici munite di strutture proiettive complesse. Essi hanno osservato che lo spazio delle strutture proiettive munite di circle packing con una combinatoria fissata è descritto da una varietà algebrica reale di dimensione 6g−6, dove g è il genere della superficie e hanno lasciato aperte tre domande: (1) stabilire se tale varietà algebrica sia liscia, (2) stabilire se l’inclusione naturale di tale spazio nello spazio delle strutture proiettive sia un’immersione, (3) stabilire se la mappa che associa a ogni elemento di questa varietà la struttura complessa soggiacente sia un locale diffeo. Nel seminario parlerò di questi problemi e di alcuni risultati parziali recentemente ottenuti in collaborazione con Mike Wolf. A presto, Carlo e Filippo

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Scuola di topologia
by Bruno Martelli 09 Jan '25

09 Jan '25

Segnalo questa scuola che mi sembra molto adatta per i topologi pisani Bruno https://www.icmat.es/schools/2025/MSBG/index.php

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Fwd: Fw: Postdoc in Bilbao
by Bruno Martelli 09 Jan '25

09 Jan '25

---------- Forwarded message --------- Da: Llosa, Claudio (IAG) <claudio.llosa(a)kit.edu> Date: Mar 7 Gen 2025, 18:50 Subject: Fw: Postdoc in Bilbao To: Bruno Martelli <bruno.martelli(a)unipi.it> Karlsruhe Institute of Technology (KIT) Institute for Algebra and Geometry JProf. Dr. Claudio Llosa Isenrich Juniorprofessor for Geometry KIT Faculty of Mathematics Englerstraße 2 <https://www.google.com/maps/search/Englerstra%C3%9Fe+2+%0D%0A76131+Karlsruh…> 76131 Karlsruhe, Germany <https://www.google.com/maps/search/Englerstra%C3%9Fe+2+%0D%0A76131+Karlsruh…> Phone: +49 721 608-43914 Email: claudio.llosa(a)kit.edu Website: https://www.math.kit.edu/iag2/~llosa/en Registered office: Kaiserstraße 12, 76131 Karlsruhe, Germany <https://www.google.com/maps/search/Kaiserstra%C3%9Fe+12,+76131+Karlsruhe,+G…> KIT – The Research University in the Helmholtz Association ------------------------------ *From:* geom-group-theory-request(a)lists.illinois.edu < geom-group-theory-request(a)lists.illinois.edu> on behalf of MONTSERRAT CASALS RUIZ <montserrat.casals(a)ehu.eus> *Sent:* Tuesday, January 7, 2025 9:20:44 AM *To:* geom-group-theory(a)lists.illinois.edu *Subject:* [geom-group-theory] Postdoc in Bilbao Dear colleagues, We are pleased to advertise a *two-year postdoctoral *position in geometric group theory, based at the University of the Basque Country (UPV-EHU) in *Bilbao* and mentored by Montserrat Casals-Ruiz. The position comes with no compulsory teaching load, and there will be a possibility of obtaining additional funding to extend the contract through December 2027. The starting date is negotiable, contingent on the candidate fulfilling the requirements set by the Spanish administration, although it should be no later than October 2025. The salary will be according to the Convenio colectivo de personal laboral docente e investigador de la UPV/EHU (approximately 38,000 euros, before tax). This position is part of the project “Mapping class groups from above and from below”, funded by the Agencia Estatal de Investigación (AEI) and the Deutsche Forschungsgemeinschaft (DFG), as a collaboration of Javier Aramayona (ICMAT), Montserrat Casals-Ruiz (Bilbao), Elia Fioravanti (KIT), Claudio Llosa-Isenrich (KIT), and Katrin Tent (Münster). There will be numerous opportunities for interactions with researchers based at the other three institutions. Candidates with expertise related to the project themes are particularly encouraged to apply. These include, but are not limited to: right-angled Artin groups, actions on R-trees and cube complexes; mapping class groups; Burnside groups and small cancellation theory; and Kähler groups. Interested candidates should submit a CV, a research statement (maximum 2 pages), and a cover letter to mafabproject(a)gmail.com using the subject "Postdoc MAFAB Bilbao", before *February 7, 2025*. Additionally, applicants may arrange for up to two referees to send recommendation letters directly to the same email address. Please note that we will not contact referees to request letters on behalf of the applicants. For further information, please feel free to contact us informally per email. Montse Casals-Ruiz

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Fwd: Fw: 2-year postdoc in Karlsruhe or Muenster
by Bruno Martelli 09 Jan '25

09 Jan '25

---------- Forwarded message --------- Da: Llosa, Claudio (IAG) <claudio.llosa(a)kit.edu> Date: Mar 7 Gen 2025, 18:48 Subject: Fw: 2-year postdoc in Karlsruhe or Muenster To: Bruno Martelli <bruno.martelli(a)unipi.it> ------------------------------ *From:* geom-group-theory-request(a)lists.illinois.edu < geom-group-theory-request(a)lists.illinois.edu> on behalf of Fioravanti, Elia (IAG) <elia.fioravanti(a)kit.edu> *Sent:* Tuesday, January 7, 2025 10:19:57 AM *To:* geom-group-theory(a)lists.illinois.edu *Subject:* [geom-group-theory] 2-year postdoc in Karlsruhe or Muenster Dear Colleagues, We would like to advertise a 2-year postdoc position in Geometric Group Theory, to be based either at the Karlsruhe Institute of Technology or at the University of Münster, under the mentorship of Elia Fioravanti, Claudio Llosa Isenrich or Katrin Tent. The position comes with no compulsory teaching load and there may be the possibility of an extension to a 3rd year. It is paid according to the German E13 TV-L pay grade. The starting date is flexible, though it should be in October 2025 at the latest. The position is part of the project "Mapping class groups from above and below", jointly funded by the German and Spanish Research Foundations as a collaboration of Fioravanti, Llosa Isenrich and Tent with Javier Aramayona (Madrid) and Montserrat Casals-Ruiz (Bilbao). There will be numerous opportunities for interactions with researchers based at the other three institutions. Project topics include, but are not limited to: Burnside groups and small cancellation theory; Kähler groups; actions on R-trees and cube complexes; mapping class groups and Out(F_n). Applications should be submitted via email at the address mafab-project(a)lists.kit.edu and should consist of the following documents (as a single pdf file): - a CV, including list of publications; - a research statement outlining past and future research (max 2 pages); - a cover letter which also indicates a preferred choice of host institution ; - 2 letters of recommendation, to be submitted at the same address by the referees. All documents must be received by the deadline of *7 February 2025*. Please note that we will not contact referees to request letters on behalf of the applicants. For further information, please feel welcome to contact us informally per email. Best wishes, Elia Fioravanti (KIT), Claudio Llosa Isenrich (KIT), Katrin Tent (Münster)

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I: Spring school on singularities - Nantes - 22nd-25th April 2025
by Paolo Lisca 18 Dec '24

18 Dec '24

Inoltro annuncio di scuola primaverile. Paolo Lisca ________________________________ Da: Fabio Gironella <fabio.gironella(a)univ-nantes.fr> Inviato: martedì 17 dicembre 2024 14:03 A: orga-school-sing(a)univ-nantes.fr Oggetto: Spring school on singularities - Nantes - 22nd-25th April 2025 Dear friends and colleagues, We are pleased to announce a spring school at Nantes Université, which will take place from the 22nd to the 25th of April 2025. The school is part of the thematic semester 2025 Singularities<https://www.lebesgue.fr/fr/semestre2025>, organised by the Centre Henri Lebesgue<https://www.lebesgue.fr/fr>. Our school, aimed at Master and PhD students, will focus on singularities in low-dimensional and symplectic topology. It will mainly revolve around two mini-courses, of four hours plus an exercise session each. The two courses will be given by Anne Pichon<https://www.i2m.univ-amu.fr/perso/anne.pichon/> (Aix-Marseille Université), on the low-dimensional side, and by Jonathan Evans<https://jde27.uk/> (Lancaster University), on the symplectic side. Beside the two mini-courses, there will be a session for short talks. We invite participants who would like to talk about their research to submit a title and an abstract. The schedule will be rather light, so enough time will be left for participants to discuss together and discover each other's research interests. Registration is open until February 23rd 2024. We will be able to provide accommodation (in twin bedrooms) for a limited number of participants. You can register and apply for funding here<https://www.lebesgue.fr/fr/lowdim-symp2025/inscription>. More information on the school can be found at these pages: https://fabiogironella.com/events/25_04_spring_school_nantes_singularities/ and https://www.lebesgue.fr/en/lowdim-symp2025 Please forward this announcement to colleagues/students who might be interested in attending the spring school. Best regards, Fabio Gironella, Marco Golla and Stéphane Guillermou (the organisers)

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Seminario Baby Geometri 17/12
by Giovanni Framba 12 Dec '24

12 Dec '24

Carə tuttə, Vi invitiamo al seminario dei Baby Geometri della prossima settimana: Martedì 17 Dicembre 2024, alle ore 11:30 Presso l’Aula Seminari del Dipartimento di Matematica Giacomo Bascapè (Université du Québec à Montréal) terrà un seminario dal titolo: SU(2)-representations of 3-manifolds: a brave new world di cui riportiamo l'abstract: In this talk, we will explore the world of SU(2) representations applied to 3-manifolds. First, we will introduce the importance of SU(2)-representations as an invariant of non-triviality. Then, we will describe this theory's relations to the L-space conjecture, particularly to instanton Floer homology. Finally, we will apply some of these techniques to the case of graph manifolds with small order. Vi ricordiamo che potrete trovare informazioni sui prossimi seminari sul nostro sito https://sites.google.com/view/babygeometri. Tutte le persone interessate sono invitate a partecipare. A presto, Elena Bogliolo Pietro Capovilla Alessio Di Prisa Giovanni Framba Ervin Hadžiosmanović

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Seminario di Geometria 10 Dicembre - Enrico Trebeschi
by Carlo Collari 06 Dec '24

06 Dec '24

Buongiorno, Ricordo a tutti gli interessati che il prossimo (e ultimo per questo semestre) seminario di geometria sarà tenuto da Enrico Trebeschi e si terrà Martedì 10 Dicembre alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 13:00. Allego titolo e abstract: Titolo: Rigidity Results for Maximal Submanifolds in Pseudo-Hyperbolic Space Abstact: Maximal submanifolds are the generalization in pseudo-Riemannian geometry of minimal surfaces. Their study in pseudo-hyperbolic space, which is the generalization of hyperbolic space in mixed signature, is motivated by several factors ranging from differential geometry, relativistic physics, and, in recent years, geometric topology. A classical problem in the study of minimal submanifolds of the unit sphere is to find a universal upper bound for the norm of the second fundamental form, that is, to estimate their extrinsic curvature. In this seminar, I will discuss a recent work in collaboration with Alex Moriani (Université Côte d'Azur), in which we provide a sharp bound on the norm of the second fundamental form for maximal submanifolds in pseudo-hyperbolic space. In particular, this bound is rigid, meaning it is achieved identically, and we are able to explicitly classify the submanifolds that achieve it. Gauss equation translates the estimate on the extrinsic curvature in trems of the intrinsic curvature, allowing us to prove that the scalar curvature of a maximal submanifold is non-positive and to classify those with vanishing scalar curvature. In the Lorentzian case, we are able to provide a rigid estimate on the Ricci curvature as well. If I have time, I would like to discuss the implications of this work in the context of Teichmüller theory of higher rank and dimension, namely the study of connected components of Hom(π1(M), G) containing only faithful and discrete representations, where M is a closed manifold of dimension n>2 and G is a semi-simple Lie group of rank >1. A presto, Carlo e Filippo

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Seminario Baby Geometri 10/12
by Giovanni Framba 06 Dec '24

06 Dec '24

Carə tuttə, Vi invitiamo al seminario dei Baby Geometri della prossima settimana: Martedì 03 Dicembre 2024, alle ore 11:30 Presso l’Aula Seminari del Dipartimento di Matematica Luigi Marigliano(Università di Pisa) terrà un seminario dal titolo: Riemannian holonomy classification di cui riportiamo l'abstract: Holonomy was introduced by Élie Cartan in 1926 and has since then provided a way to apply the machinery of Lie groups representation to study Riemannian manifolds. In this talk we will start by introducing holonomy in vector and principal bundles, providing some examples, to arrive at the main result obtained by Berger for the classification of the holonomy of Riemannian manifolds. Vi ricordiamo che potrete trovare informazioni sui prossimi seminari sul nostro sito https://sites.google.com/view/babygeometri. Tutte le persone interessate sono invitate a partecipare. A presto, Elena Bogliolo Pietro Capovilla Alessio Di Prisa Giovanni Framba Ervin Hadžiosmanović

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Seminario di Geometria 3 Dicembre 2024 - Andrea Sambusetti
by Carlo Collari 02 Dec '24

02 Dec '24

Buongiorno, Ricordo a tutti gli interessati che il prossimo seminario di geometria sarà tenuto da Andrea Sambusetti e si terrà domani Martedì 3 Dicembre alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 13:00. Allego titolo e abstract: Titolo: Two rigidity theorems for CAT(0)-spaces (via convergence theory) Abstact: I will present two rigidity results about CAT(0)-spaces. The first one concerns the isolation of flat spaces among (geodesically complete) CAT(0)-spaces admitting cocompact lattices, provided that the codiameter is uniformily bounded. The second one is an entropy-pinching theorem saying that if a uniformly packed and uniformly cocompact CAT(0)-space has entropy small enough, then it is flat. Both results stem from a careful study of the theory of (equivariant) Gromov-Hausdorff convergence of lattices of CAT(0)-spaces and of their possible degenerations, whose main lines I will try to explain. A presto, Carlo e Filippo

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Seminario Baby Geometri 03/12
by Giovanni Framba 28 Nov '24

28 Nov '24

Carə tuttə, Vi invitiamo al seminario dei Baby Geometri della prossima settimana: Martedì 03 Dicembre 2024, alle ore 11:30 Presso l’Aula Mancini del Palazzo della Carovana Gaëtan Simian (Université de Genève) terrà un seminario dal titolo: The Arf invariant of colored links di cui riportiamo l'abstract: The Arf invariant is a modulo 2 integer associated to a non-singular quadratic form over the field F2. In 1965, Robertello applied this theory to Seifert forms, leading to an invariant of a certain class of oriented links. Colored links are a natural generalisation of oriented links, where the components are grouped into sublinks. Several invariants of oriented links, such as the Alexander module and the Levine-Tristram signature, admit natural multivariable extensions to colored links via so-called "generalised Seifert surfaces". In this talk, I will define these notions and briefly explain how to use generalised Seifert surfaces to extend the Arf-Robertello invariant to colored links. Unfortunately, these extensions turn out to be determined by the linking numbers. Vi ricordiamo che potrete trovare informazioni sui prossimi seminari sul nostro sito https://sites.google.com/view/babygeometri. Tutte le persone interessate sono invitate a partecipare. A presto, Elena Bogliolo Pietro Capovilla Alessio Di Prisa Giovanni Framba Ervin Hadžiosmanović

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First Announcement - Sub-Riemannian Geometry and Beyond, IV
by Enrico Le Donne 27 Nov '24

27 Nov '24

First Announcement Sub-Riemannian Geometry and Beyond, IV Fribourg (Switzerland), 23-28 of June 2025 https://sites.google.com/view/srgb/home/4 The 2025 meeting will focus on scientific applications of sub-Riemannian geometry. Examples of topics are Machine Learning, Modelling, Numerics, Finance, Diffusion processes, Mechanics, Image processing, Neuroscience, and Optimal Transport. ________Speakers for mini-courses Frédéric Jean -- a course on Modelling and Trajectory planning via sub-Riemannian Geometry. Jean-Marie Mirebeau -- a course on Numerical solution of sub-Riemannian Eikonal equations, and some applications. Andrea Pascucci -- a course on the role of sub-Riemannian geometry in Finance. Ludovic Rifford -- a course on the basics of sub-Riemannian geometry, and optimal transport. Alessandro Scagliotti -- a course on Machine Learning through the lens of sub-Riemannian Geometry. ________Speakers for research talks Remco Duits Peter Friz Paul Gassiat Xue-Mei Li Elisa Negrini Dario Prandi Alessandro Sarti Yannick Sire Anton Thalmaier Check more info at https://sites.google.com/view/srgb/home/4

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Seminario di Geometria del 26 Novembre - Alessio Di Prisa
by Carlo Collari 22 Nov '24

22 Nov '24

Buongiorno, Ricordo a tutti gli interessati che il prossimo seminario di geometria sarà tenuto da Alessio Di Prisa (SNS) e si terrà Martedì 26 Novembre alle ore 14:30 presso l’Aula Riunioni. Allego titolo e abstract: Titolo: On rational sliceness of negative amphichiral links. We say that a link L in S3 is negative amphichiral if there exists an orientation-reversing diffeomorphism of S3 that sends every component of L to itself with the opposite orientation. If such a map can be chosen to be an involution, then the link is said to be strongly negative amphichiral. Kawauchi proved that every strongly negative amphichiral link is rationally slice, i.e. it bounds a disjoint collection of disks in a rational homology 4-ball. In this talk, we prove that every negative amphichiral link is rationally slice, extending the aforementioned work of Kawauchi. Our proof relies on a careful analysis of the JSJ decomposition of the link complement of negative amphichiral links. This is joint work in progress with Jaewon Lee (KAIST, Daejeon) and Oğuz Şavk (CNRS, Nantes). A presto, Carlo e Filippo

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I: 3 years postdoc position at the FCG
by Paolo Lisca 22 Nov '24

22 Nov '24

Inoltro annuncio di posizione postdoc. Paolo Lisca ________________________________ Da: Alberto Abbondandolo <alberto.abbondandolo(a)rub.de> Inviato: giovedì 21 novembre 2024 18:33 Oggetto: 3 years postdoc position at the FCG Dear colleagues, The Floer Centre of Geometry in Bochum invites applications for a 3 years postdoctoral fellowship in mathematics (application’s deadline: December 15, 2024). See https://math.ruhr-uni-bochum.de/fakultaet/floer-zentrum/ for more information. We would be grateful if you could share this information with potential applicants. Best regards Alberto Abbondandolo -------------------------------------------------- Prof. Alberto Abbondandolo Ruhr-Universität Bochum Fakultät für Mathematik Gebäude IB - Raum 3/65 D-44780 Bochum Germany

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I: [rtop] BTW: Program and registration
by Paolo Lisca 21 Nov '24

21 Nov '24

Inoltro annuncio di scuola invernale. Paolo Lisca -------- Forwarded Message -------- Subject: [rtop] BTW: Program and registration Date: Wed, 20 Nov 2024 17:55:47 +0100 From: wagner(a)imj-prg.fr<mailto:wagner@imj-prg.fr> Dear fellow topologists, As previsously annouced, the 5th instance of Topology Between The Waves (aka BTW5) will occur from the 9th to the 14th of March 2025. Like last year we'll be in the Station Biologique of Besse, birth place of Nicolas Bourbaki (not too far from Clermont-Ferrand). This year's topic is a theorem by Giroux called the "Giroux correspondence". It relates open-book decompostions of 3-manifolds (topological structures) and contact structures (geometrical structures). We'll follow the proof strategy of Licata--Vertesi (on the tight case). This winter school is aimed at PhD students and young postdocs (as well as our favorite senior researchers!). The idea is to try to go through this proof together, after have learned about the necessary background. Participants are therefore encourage to give a talk (or to help preparing one). At the moment there are 15.5 talks planned see the program available here: https://lrobert.perso.math.cnrs.fr/BTW5/BTW5Program.pdf This program might changed marginally (especially if you have comment complaints or suggestions). We can have up to 35 people in Besse. Housing cost and food is covered by the conference (and we have a plan to be better on the food side, than last year). A bus shuttle from Clermont Ferrand to Besse on Sunday evening and from Besse to Clermont-Ferrand on friday afternoon will be arranged. Besides this, we do not plan to cover transport, but let us know if you have difficulties. If you want to participate, please answer to this email (with all the organizers in CC) and tell us which talk(s) suit(s) you in preference order. As usual, the final repartition will be decided as soon as possible on a first arrived first served basis with priority given to young PhD students. There is a webpage: https://lrobert.perso.math.cnrs.fr/BTW5/btw5.html Which will soon be updated. Logistical details will be provided to the participants in due time, but bare in mind that due to its relative remoteness, it is difficult to participate to only part of the week. Please circulate this announcement among your colleagues and using your usual math mailing list. Would you have any question, do not hesitate to ask the organizers. Best, Marco De Renzi Quentin Faes Jules Martel Delphine Moussard Louis-Hadrien Robert

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Seminario Baby Geometri 26/11
by Giovanni Framba 21 Nov '24

21 Nov '24

Carə tuttə, Vi invitiamo al seminario dei Baby Geometri della prossima settimana: Martedì 26 Novembre 2024, alle ore 11:30 Presso l’Aula Bianchi Lettere del Palazzo della Carovana Sofia Amontoia (Université de Genève) terrà un seminario dal titolo: Cohomologically flavoured invariants for representations di cui riporto l'abstract: Consider the set of representations of Hom(π1(M),G) for M some manifold and G an interesting Lie group. How can their nature be understood? An approach for a classification of these was kickstarted by Goldman in the 80s leading to the emergence of Higher Teichmueller theory, nowadays an actively growing field. In the talk we shall outline the essence of this approach where the so-called Toledo invariant takes a central role. Then, realizing that the Toledo invariant is actually a cohomological invariant, is the point of view that allows to generalize aspects of Goldman's classification. If time permits, we shall briefly discuss how bounded cohomology comes into play and proves to be a powerful tool. Vi ricordiamo che potrete trovare informazioni sui prossimi seminari sul nostro sito https://sites.google.com/view/babygeometri. Tutte le persone interessate sono invitate a partecipare. A presto, Elena, Pietro, Alessio, Giovanni, Ervin

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I: Topological workshop at Matemale 2025, first announcement
by Paolo Lisca 18 Nov '24

18 Nov '24

Inoltro annuncio di scuola per la prossima primavera. Paolo Lisca -------- Forwarded Message -------- Subject: Topological workshop at Matemale 2025, first announcement Date: Sat, 16 Nov 2024 22:10:36 +0100 From: thomas fiedler <thomas.fiedler(a)math.univ-toulouse.fr><mailto:thomas.fiedler@math.univ-toulouse.fr> Dear friends and colleagues, the next topological spring-summer school in Matemale (formerly Llagonne) will take place from 19/05/2025 to 23/05/2025 about Khovanov homology and exotic phenomena and is organized by Jean-François Barraud, Vincent Florens, Hoel Queffelec, Delphine Moussard and myself. You are very welcome to participate. Khovanov homology is an invariant of knots and links introduced by Khovanov in the 90s and widely studied since then. In particular, a variant of this homology due to Lee allowed Rasmussen to define a numerical invariant called the s-invariant. It appears, thanks to the work of several authors in the last years, that this s-invariant helps to detect exotic phenomena. Please forward the information to everybody who could be interested in it, especially to your students and your colleagues outside of low dimensional topology. Thanks to Delphine and Hoel we have a beautiful program which you can find on the web page https://sites.google.com/view/matemale-maths-school There will be 16 talks. Please feel free to choose a talk if you like to give one. We will be accomodated as usually in the Centre de vacances "La Capcinoise", more precisely in their gites ruraux. They have a web page https://www.lacapcinoise.fr/ . This is just for information, you don't need to make a reservation by yourself. As usual we will completely cover your stay. Please send us a mail if you are interested to participate, if you would like to give a talk and which one, and whether or not you need financial support. We hope to see you all in May! Best regards in the name of the organizers, Thomas

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Seminario Baby Geometri 19/11
by Giovanni Framba 14 Nov '24

14 Nov '24

Carə tuttə, Vi invitiamo al seminario dei Baby Geometri della prossima settimana: Martedì 19 Novembre 2024, alle ore 11:30 Presso l’Aula Seminari del Dipartimento di Matematica Julian Wyckowski (Università di Cambridge) terrà un seminario dal titolo: Three notions of accessibility for profinite groups acting on profinite trees di cui riporto l'abstract: The theory of groups acting on trees—attributed to Bass and Serre—provides a rich framework for the understanding of structural and homological properties of discrete groups. In this talk, I will introduce the profinite analogue of this theory, developed by Melnikov, Zalesskii and Ribes. I will outline some of the difficulties encountered when passing from the discrete to the profinite world, as well as some solutions. I will also introduce three notions of accessibility in the context of profinite/pro-p groups acting on profinite/pro-p trees and discuss a result of mine as well as two open questions regarding accessibility. Time permitting, I will outline some applications to other topics in profinite rigidity. Vi ricordiamo che potrete trovare informazioni sui prossimi seminari sul nostro sito https://sites.google.com/view/babygeometri. Tutte le persone interessate sono invitate a partecipare. A presto, Elena, Pietro, Alessio, Giovanni, Ervin

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Pranzo con lo speaker
by Carlo Collari 12 Nov '24

12 Nov '24

Buongiorno, Per tutti gli interessati ad andare a pranzo con lo speaker del seminario di Geometria di oggi, l'appuntamento è alle 13 in atrio. A presto, Carlo

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Seminario di Geometria del 29 Ottobre - Nikolay Abrosimov
by Carlo Collari 10 Nov '24

10 Nov '24

Buongiorno, Ricordo a tutti gli interessati che il prossimo seminario di geometria sarà tenuto da Nikolay Abrosimov e si terrà Martedì 12 Novembre alle ore 14:30 presso l’Aula Magna. Allego titolo e abstract: Titolo: Euclidean volume of a cone manifold over any hyperbolic knot is an algebraic number Abstract: The talk is based on our joint work [1] with Alexander Kolpakov (Université de Neuchâtel, Switzerland) and Alexander Mednykh (Sobolev Institute of Mathematics, Novosibirsk). A hyperbolic structure on a three-dimensional cone manifold with a knot as a singular set can usually be deformed into a limit Euclidean structure. In our paper [1] we show that the corresponding normalized Euclidean volume of the manifold is always an algebraic number i.e. a root of some polynomial with integer coefficients. This result is a generalization (for cone manifolds) of the well-known Sabitov theorem on the volumes of Euclidean polyhedra which gave an answer to the bellows problem. The fact we established stands out against the background of hyperbolic volumes the number-theoretic nature of which is usually quite complex. In addition to this theorem we propose an algorithm that allows one to explicitly calculate the minimal polynomial for a normalized Euclidean volume. References: [1] N. Abrosimov A. Kolpakov A. Mednykh Euclidean volumes of hyperbolic knots // Proc. Amer. Math. Soc. 152 (2024) 869-881. DOI: 10.1090/proc/16353 A presto, Filippo

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Baby Geometri 12/11
by Giovanni Framba 09 Nov '24

09 Nov '24

Carə tuttə, Vi invitiamo al seminario dei Baby Geometri della prossima settimana: Martedì 12 Novembre 2024, alle ore 11:30 Presso l’Aula Seminari del Dipartimento di Matematica Sirio Resteghini (Università di Pisa) terrà un seminario dal titolo: Topological aspects and dual structures of Artin groups di cui riportiamo l'abstract: The K(π,1) conjecture for Artin groups goes back to the work of Arnol’d, Brieskorn, Pham, and Thom in the '60s. Recently, the dual approach has been instrumental in proving that conjecture in the affine and rank 3 cases. In this talk, we will introduce Coxeter groups and Artin groups, providing some basic examples and stating the K(π,1) conjecture. We will then introduce the standard and dual structures for Artin groups, highlighting the results in the spherical, affine and rank 3 cases. Finally, we will give a few results about the isomorphism between the standard and dual Artin groups. Vi ricordiamo che potrete trovare informazioni sui prossimi seminari sul nostro sito https://sites.google.com/view/babygeometri. Tutte le persone interessate sono invitate a partecipare. A presto, Gli organizzatori

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Seminario Baby Geometri 29/10
by Giovanni Framba 24 Oct '24

24 Oct '24

Carə tuttə, Vi invitiamo al seminario dei Baby Geometri della prossima settimana: Martedì 29 Ottobre 2024, alle ore 11:30 Presso l’Aula Seminari del Dipartimento di Matematica Matteo Verni (Sorbonne Université) terrà un seminario dal titolo: L'omologia d'intersezione e la topologia algebrica di varietà singolari di cui riportiamo l'abstract: Uno degli aspetti che rendono la (co)omologia singolare interessante è il fatto che per spazi topologici particolarmente buoni, presenta simmetrie non banali: per esempio la dualità di Poincaré per varietà topologiche orientabili, e molte altre simmetrie sorprendenti (il cosiddetto Kahler package) per varietà complesse compatte con una buona metrica. Purtroppo, queste simmetrie coomologiche falliscono in presenza di singolarità. In questo talk, introdurremo l'omologia d'intersezione, che coincide con l'omologia singolare classica per varietà topologiche ma ha il vantaggio di produrre gruppi di omologia che rispettano ancora le simmetrie che trovavamo per spazi lisci. Vi ricordiamo che potrete trovare informazioni sui prossimi seminari sul nostro sito https://sites.google.com/view/babygeometri. Tutte le persone interessate sono invitate a partecipare. A presto, Elena Bogliolo Pietro Capovilla Alessio Di Prisa Giovanni Framba Ervin Hadžiosmanović

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Fw: Seminario di Geometria del 29 Ottobre 24 - Andrea Seppi
by Carlo Collari 24 Oct '24

24 Oct '24

________________________________ From: Filippo Sarti via Assegnisti <assegnisti(a)lists.dm.unipi.it> Sent: Thursday, October 24, 2024 10:18:15 AM To: assegnisti(a)lists.dm.unipi.it; dottorandi(a)lists.dm.unipi.it; geometria_pisa(a)lists.dm.unipi.it Subject: [Assegnisti] Seminario di Geometria del 29 Ottobre 24 - Andrea Seppi Buongiorno, Ricordo a tutti gli interessati che il prossimo seminario di geometria sarà tenuto da Andrea Seppi e si terrà Martedì 29 Ottobre alle ore 14:30 presso l'aula Riunioni. Allego titolo e abstract: Titolo: Topology of convex projective four-manifolds Abstract: I will discuss topological obstructions for a closed four-manifold that admits a (real) properly convex projective structure. I will present a vanishing result on the Pontryagin classes, that in dimension four provides information on the geography problem for properly convex projective manifolds, and implies the solution to a question of Yves Benoist on the (in)compatibility of real convex projective structures and complex hyperbolic structures. Time permitting, I will also discuss the construction of examples that realize all possible positive values of the Euler characteristic. Based on joint work with Stefano Riolo and Leone Slavich. A presto, Filippo _______________________________________________ Assegnisti mailing list -- assegnisti(a)lists.dm.unipi.it To unsubscribe send an email to assegnisti-leave(a)lists.dm.unipi.it

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Seminario di Geometria Domani - Miguel Orbegozo Rodriguez
by Carlo Collari 21 Oct '24

21 Oct '24

Buongiorno, Ricordo a tutti gli interessati che il prossimo seminario di geometria sarà tenuto da Miguel Orbegozo Rodriguez e si terrà domani Martedì 22 Ottobre alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 12:30. Allego titolo e abstract: Titolo: Murasugi sums and primeness of links Abstact: In this talk I will present some results on how primeness of fibered links behaves under an operation called the Murasugi sum, which generalises the connected sum. As an application, this allows us to resolve a 30 year old conjecture of Cromwell in the case of braid closures. Cromwell showed that, if a link diagram represented as a positive braid features no circles that decompose it as a connected sum (in other words, it is not "obviously" composite), then the link is indeed prime. In his words, "positive braids are visually prime". He further conjectured that the same would hold for link diagrams that yield minimal genus Seifert surfaces when Seifert's algorithm is applied. If the diagram is required to be a braid closure, then Cromwell's condition is equivalent to the braid being homogeneous. Thus, we show that homogeneous braids are visually prime. This is joint work with Peter Feller and Lukas Lewark. A presto, Carlo

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Seminario di Geometria del 22 Ottobre 24 - Miguel Orbegozo Rodriguez
by Carlo Collari 14 Oct '24

14 Oct '24

Buongiorno, segnalo a tutti gli interessati che il prossimo seminario di geometria sarà tenuto da Miguel Orbegozo Rodriguez e si terrà Martedì 22 Ottobre alle ore 14:30 presso l'Aula Riunioni del Dipartimento di Matematica. Inoltre ne aprofitto per ricordare che il seminario di geometria generalmente si terrà il Martedì alle 14:30 invece che il Giovedì alle 11:00. Allego titolo e abstract: Titolo: Murasugi sums and primeness of links Abstact: In this talk I will present some results on how primeness of fibered links behaves under an operation called the Murasugi sum, which generalises the connected sum. As an application, this allows us to resolve a 30 year old conjecture of Cromwell in the case of braid closures. Cromwell showed that, if a link diagram represented as a positive braid features no circles that decompose it as a connected sum (in other words, it is not "obviously" composite), then the link is indeed prime. In his words, "positive braids are visually prime". He further conjectured that the same would hold for link diagrams that yield minimal genus Seifert surfaces when Seifert's algorithm is applied. If the diagram is required to be a braid closure, then Cromwell's condition is equivalent to the braid being homogeneous. Thus, we show that homogeneous braids are visually prime. This is joint work with Peter Feller and Lukas Lewark. <https://www.dm.unipi.it/en/seminar/?id=66fbeae742845121abe42be8> A presto, Carlo

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Seminario di Geometria del 10 Ottobre 24 - Yan Mary He
by Carlo Collari 08 Oct '24

08 Oct '24

Buongiorno, segnalo a tutti gli interessati che il seminario di Yan Mary He si terrà Giovedì 10 Ottobre alle ore 11:00 presso l'Aula Riunioni del Dipartimento di Matematica. Allego titolo e abstract: Titolo: Relative train tracks and endperiodic graph maps Abstact: If G is a connected finite graph (i.e., G has finitely many vertices and edges), a graph map (i.e., a homotopy equivalence) f: G \to G can be viewed as a topological representative of an outer automorphism of the finitely generated free group \pi_1G. The outer automorphism group Out(F_n) of a free group F_n on n generators has been proven to share many similar properties of the mapping class group of a compact surface. If G is an infinite graph (i.e.,G has infinitely many vertices and edges), the structure of a (proper) graph map f: G \to G is more complicated and less understood. Inspired by the recent work of Cantwell-Conlon-Fenley on homeomorphisms of infinite type surfaces, we introduce and study endperiodic graph maps f: G \to G where G has finitely many ends. We prove that any such a map is homotopic to an endperiodic relative train track map, which is a normal form for an endperiodic graph map. Moreover, we show that the Perron-Frobenius eigenvalue of the transition matrix is a canonical quantity associated to the map. This is joint work with Chenxi Wu. link: https://www.dm.unipi.it/en/seminar/?id=66fbeae742845121abe42be8<https://www.dm.unipi.it/en/seminar/?id=66fbeae742845121abe42be8> <https://www.dm.unipi.it/en/seminar/?id=66fbeae742845121abe42be8> A presto, Carlo

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Assegno
by Bruno Martelli 12 Sep '24

12 Sep '24

Buongiorno, È uscito il bando per l'assegno in algebra e geometria presso il nostro dipartimento: https://bandi.unipi.it/public/Bandi/Detail/86b7b083-0de4-4d15-b9b2-ca1002a1… . La scadenza per la presentazione delle domande è *il 10 ottobre 2024 alle ore 13.00*.

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Seminario di geometria 12/9
by Diego Conti 08 Sep '24

08 Sep '24

Buonasera, segnalo che giovedì 12 settembre alle 14.30 in aula seminari Federico Alberto Rossi (Università di Perugia) terrà un seminario dal titolo *Constructing Indefinite Einstein Solvmanifolds Beyond Nilsolitons* di cui riporto l'abstract: In the Riemannian setting, the theory of Einstein solvmanifolds is well established and extensively understood. In this seminar, we will initially review the Riemannian case, providing a foundation for our subsequent exploration of the indefinite setting. Then, we will switch to indefinite metrics, highlighting with examples the differences with the Riemannian case. However, we will describe analogous techniques for constructing pseudo-Riemannian Einstein solvmanifolds using indefinite nilsolitons, emphasizing the role of pseudo-Iwasawa decomposition and nice nilpotent Lie algebras. Next, we will introduce two distinct methods for constructing Einstein solvmanifolds, which are not based on nilsolitons and are unique to the indefinite setting. The first approach involves contact symplectic reduction, a technique characteristic of pseudo-Sasaki geometry. The second, a more recent development, is based on solving the generalized nilsoliton equation and presents a new methodological framework. Both methods produce examples of Einstein solvmanifolds that are not isometric to any of the pseudo-Iwasawa type. Time permitting, we will also discuss the interplay between Einstein solvmanifolds and related geometric structures, such as Sasaki, pseudo-Kähler, and para-Kähler geometries. This presentation is based on joint work with D. Conti and R. Segnan Dalmasso. Per chi fosse interessato ad andare a pranzo con lo speaker ci troveremo alle 13 in atrio. A presto, Diego

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Fwd: REMINDER - Bandi di concorso Assegni di Ricerca Post dottorali INdAM
by Bruno Martelli 05 Sep '24

05 Sep '24

---------- Forwarded message --------- Da: ISTITUTO NAZIONALE DI ALTA MATEMATICA <indam(a)altamatematica.it> Date: Gio 5 Set 2024, 11:30 Subject: REMINDER - Bandi di concorso Assegni di Ricerca Post dottorali INdAM To: gnampa-aderenti(a)altamatematica.it <gnampa-aderenti(a)altamatematica.it>, gnsaga-aderenti(a)altamatematica.it <gnsaga-aderenti(a)altamatematica.it>, gnfm-aderenti(a)altamatematica.it <gnfm-aderenti(a)altamatematica.it>, gncs-aderenti(a)altamatematica.it <gncs-aderenti(a)altamatematica.it> A tutti gli aderenti, si ricorda che sono disponibili due *Bandi di concorso, *le cui domande dovranno essere presentate entro il *20 settembre 2024* esclusivamente mediante apposita modulistica elettronica predisposta all'interno del sito WEB dell'INdAM: https://www.altamatematica.it/bandi/: *1) Bando di concorso a n. 6 assegni post dottorali di collaborazione ad attività di* *ricerca per l'a.a. 2024-2025 *pubblicato sulla Gazzetta Ufficiale 4a Serie Speciale – Concorsi ed Esami n. 62 del 02 agosto 2024. Gli assegni hanno una durata *annuale*. All’assegnista sarà corrisposta una somma pari a *€ 36.500 lordi annui*. Inoltre, l’assegnista disporrà di un fondo di ricerca pari a *€* *5.000,00 netti annui*. Al concorso possono partecipare giovani attivi nella ricerca matematica che abbiano conseguito il titolo di dottore di ricerca o titolo equipollente o un titolo di studio rilasciato da un’Università straniera comparabile al titolo di dottore di ricerca dopo il 1 giugno 2023 o che lo conseguono entro il 20 settembre 2024. *2) Bando di concorso a **n. 2 assegni post dottorali di collaborazione ad attività di* *ricerca **“Ing. Giorgio Schirillo” **per l'a.a. 2024-2025 *pubblicato sulla Gazzetta Ufficiale 4a Serie Speciale – Concorsi ed Esami n. 62 del 02 agosto 2024. Gli assegni hanno una durata *annuale*. All’assegnista sarà corrisposta una somma pari a *€ 24.000 lordi annui*. Al concorso possono partecipare giovani attivi nella ricerca matematica che abbiano conseguito il titolo di dottore di ricerca o titolo equipollente o un titolo di studio rilasciato da un’Università straniera comparabile al titolo di dottore di ricerca dopo il 20 settembre 2019 o che lo conseguono entro il 20 settembre 2024. Cordiali saluti, Segreteria INdAM [image: image.png]

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Re: Seminario Hideki Miyachi, venerdì 19 luglio, 11h
by Fabrizio Bianchi 19 Jul '24

19 Jul '24

Buongiorno, Ricordo, per chi volesse partecipare, che il seminario di Hideki Miyachi inizia tra poco in sala seminari. Cordiali saluti, Fabrizio Il lun 15 lug 2024, 18:04 Fabrizio Bianchi <fabrizio.bianchi(a)unipi.it> ha scritto: > Buongiorno, > > scrivo per avvisare che venerdì 19 alle 11, in aula seminari, ci sarà un > seminario di Hideki Miyachi (Kanazawa University, Japan), di cui riporto > sotto titolo e abstract. > > Hideki è ospite del Centro de Giorgi dal 15 al 26 luglio, per un Research > in Pairs. > > In seguito al seminario, andremo a pranzo con l'ospite (probabilmente al > Quore). Vi chiedo di farmi sapere entro mercoledì se pensate di esserci per > il pranzo, così da poter prenotare. > > Grazie in anticipo, e a presto, > Fabrizio > > > ------- > Title : Toward Complex Geometry of Teichmueller space > Abstract: > The Teichmueller space of Riemann surfaces of genus g is a deformation > space of marked Riemann surfaces of genus g. It is the orbifold universal > covering space over Riemann's moduli space of Riemann surfaces, with the > Deck transformation group being a quotient group of the mapping class > group. TheTeichmueller space has a natural complex structure and is > considered the universal space of holomorphic families of Riemann surfaces. > It also has a natural Finsler metric on the tangent bundle called the > Teichmueller metric, which coincides with the Kobayashi metric. > Furthermore, the Teichmueller space of tori is canonically identified with > the upper-half space via the generators of lattices, and the Teichmueller > metric coincides with the Poincaré metric of curvature -4. In this talk, I > will discuss my recent progress on the complex geometry of the Teichmueller > space. We will begin with the Teichmueller space of tori to discuss the > model case and present results including > > • the characterization of the PluriGreen function and the Poisson > integral formula; and > • the infinitesimal properties of the Teichmueller metric. > > If time permits, I would also like to address ongoing problems and > conjectures. > —— > > > -- > Fabrizio Bianchi > Dipartimento di Matematica > Largo Bruno Pontecorvo 5 > 56127 Pisa, Italy > https://people.cs.dm.unipi.it/bianchi/ > >

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Seminario Hideki Miyachi, venerdì 19 luglio, 11h
by Fabrizio Bianchi 16 Jul '24

16 Jul '24

Buongiorno, scrivo per avvisare che venerdì 19 alle 11, in aula seminari, ci sarà un seminario di Hideki Miyachi (Kanazawa University, Japan), di cui riporto sotto titolo e abstract. Hideki è ospite del Centro de Giorgi dal 15 al 26 luglio, per un Research in Pairs. In seguito al seminario, andremo a pranzo con l'ospite (probabilmente al Quore). Vi chiedo di farmi sapere entro mercoledì se pensate di esserci per il pranzo, così da poter prenotare. Grazie in anticipo, e a presto, Fabrizio ------- Title : Toward Complex Geometry of Teichmueller space Abstract: The Teichmueller space of Riemann surfaces of genus g is a deformation space of marked Riemann surfaces of genus g. It is the orbifold universal covering space over Riemann's moduli space of Riemann surfaces, with the Deck transformation group being a quotient group of the mapping class group. TheTeichmueller space has a natural complex structure and is considered the universal space of holomorphic families of Riemann surfaces. It also has a natural Finsler metric on the tangent bundle called the Teichmueller metric, which coincides with the Kobayashi metric. Furthermore, the Teichmueller space of tori is canonically identified with the upper-half space via the generators of lattices, and the Teichmueller metric coincides with the Poincaré metric of curvature -4. In this talk, I will discuss my recent progress on the complex geometry of the Teichmueller space. We will begin with the Teichmueller space of tori to discuss the model case and present results including • the characterization of the PluriGreen function and the Poisson integral formula; and • the infinitesimal properties of the Teichmueller metric. If time permits, I would also like to address ongoing problems and conjectures. —— -- Fabrizio Bianchi Dipartimento di Matematica Largo Bruno Pontecorvo 5 56127 Pisa, Italy https://people.cs.dm.unipi.it/bianchi/

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Workshop announcement
by Carlo Collari 03 Jul '24

03 Jul '24

Dear All, This is to announce the workshop Combinatorial Algebraic Topology, and Applications II (CATA II) that will be held at Centro De Giorgi in Pisa (IT) from the 1st to the 4th of October 2024. Registration is available at the webpage (http://www.crm.sns.it/event/532/). Registration is free, although mandatory, due to restrictions on the number of participants. A preliminary list of speakers includes: Filippo Callegaro (Università di Pisa) Paola Cristofori (Università di Modena e Reggio Emilia) Brent Everitt (University of York) Dejan Govc (University of Ljubljana) Claudia Landi (Università di Modena e Reggio Emilia) Ran Levi* (University of Aberdeen) Martino Lupini (Università di Bologna) Giuliamaria Menara (Università degli Studi di Trieste) Marija Jelic Milutinovic (University of Belgrade) Christine Vespa (Université Aix-Marseille) *to be confirmed Limited funding might be available to junior participants. In case of interest, please contact Luigi Caputi (luigi.caputi(a)unito.it<mailto:luigi.caputi@unito.it>) or Carlo Collari (carlo.collari(a)dm.unipi.it<mailto:carlo.collari@dm.unipi.it>). The workshop includes some sessions of contributed talks. Those interested in applying should send an email to crm(a)sns.it<mailto:crm@sns.it> (with the organisers in CC), including title and abstract (and financial support request, if any), for the evaluation by the Scientific Committee. The deadline for both funding and contributed talks is the 9th of August 2024. Looking forward to seeing you in Pisa. The organizers, Luigi Caputi and Carlo Collari

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Re: Seminario geometria domani
by Bruno Martelli 20 Jun '24

20 Jun '24

Per chi fosse interessato a pranzare con lo speaker, ci troviamo nell'atrio alle 12.30 Bruno Il Mer 19 Giu 2024, 10:39 Bruno Martelli <bruno.martelli(a)unipi.it> ha scritto: > Buondì, > Con colpevole ritardo vi annuncio il seminario di geometria e topologia di > domani. > A presto, > Bruno > > Orario: Giovedì 20 giugno, ore 14.30, aula seminari. > Speaker: Sam Fisher (Oxford) > Title: Maps to the circle, the integers, and L2-Betti numbers > > Abstract: Determining conditions implying that a manifold fibers over the > circle is an old and interesting problem. One of the most celebrated > results in this direction is Agol's theorem, which states that every > hyperbolic 3-manifold has a finite cover that fibers over the circle. In > higher dimensions, much less is known. Recently, > Italiano--Martelli--Migliorini gave the first example of a (cusped) > hyperbolic 5-manifold fibering over the circle, answering open questions in > topology and geometric group theory. Hyperbolic 3-manifolds and the IMM > example are examples of hyperbolic manifolds whose fundamental groups act > geometrically on CAT(0) cube complexes and consequentially have RFRS > fundamental group. In this talk, we will discuss an algebraic version of > the fibering problem: a group algebraically fibers if it maps onto the > integers with finitely generated kernel. In the class of RFRS groups, we > will see that finiteness properties of the kernel are controlled by > vanishing of L2-invariants. We will also discuss applications of these > results to high-dimensional hyperbolic manifolds >

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Seminario geometria domani
by Bruno Martelli 19 Jun '24

19 Jun '24

Buondì, Con colpevole ritardo vi annuncio il seminario di geometria e topologia di domani. A presto, Bruno Orario: Giovedì 20 giugno, ore 14.30, aula seminari. Speaker: Sam Fisher (Oxford) Title: Maps to the circle, the integers, and L2-Betti numbers Abstract: Determining conditions implying that a manifold fibers over the circle is an old and interesting problem. One of the most celebrated results in this direction is Agol's theorem, which states that every hyperbolic 3-manifold has a finite cover that fibers over the circle. In higher dimensions, much less is known. Recently, Italiano--Martelli--Migliorini gave the first example of a (cusped) hyperbolic 5-manifold fibering over the circle, answering open questions in topology and geometric group theory. Hyperbolic 3-manifolds and the IMM example are examples of hyperbolic manifolds whose fundamental groups act geometrically on CAT(0) cube complexes and consequentially have RFRS fundamental group. In this talk, we will discuss an algebraic version of the fibering problem: a group algebraically fibers if it maps onto the integers with finitely generated kernel. In the class of RFRS groups, we will see that finiteness properties of the kernel are controlled by vanishing of L2-invariants. We will also discuss applications of these results to high-dimensional hyperbolic manifolds

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Conferenza Nantes in topologia in bassa dimensione
by Bruno Martelli 10 Jun '24

10 Jun '24

Buondì, Inoltro annuncio di conferenza, attenzione perché le iscrizioni scadono in questi giorni. Bruno ----- Chers collègues, Vous êtes cordialement invité(e)s aux prochaines journées de topologie de basse dimension du Réseau Thématique RTop "Topologie algébrique et géométrique" qui auront lieu à Nantes du 26 au 30 aout prochain. https://www.math.sciences.univ-nantes.fr/~golla/docs/conferences/nantes-tre… Nous aurons le plaisir d'y écouter deux mini-cours : Marco MARENGON (Alfreìd Reìnyi Institute of Mathematics), Laura STARKSON (UC Davis), ainsi que des exposés pléniers de : Cristina ANGHEL-PALMER (University of Leeds), Roger CASALS (UC Davis), Filip MISEV (Universität Regensburg), Hoel QUEFFELEC (Université de Montpellier), Les inscriptions sont ouvertes ici : https://www.math.sciences.univ-nantes.fr/journees-de-basse-dimension/ N'hésitez pas à faire des propositions d'exposés pour enrichir le programme de la semaine et n'hésitez pas à nous contacter si besoin est. Le nombre de places étant limité, nous confirmerons les inscriptions ultérieurement. En espérant vous y voir nombreux ! Les organisateurs (M. Golla, E. Wagner) (English version) Dear colleagues, We are pleased to announce that the next Low-dimensional meeting of the Réseau Thématique RTop "Topologie algébrique et géométrique" will take place in Nantes on August 26th-30th (2024). We will have the pleasure to listen to two mini-courses by: Marco MARENGON (Alfreìd Reìnyi Institute of Mathematics), Laura STARKSON (UC Davis), as well as to plenary talks by: Cristina ANGHEL-PALMER (University of Leeds), Roger CASALS (UC Davis), Filip MISEV (Universität Regensburg), Hoel QUEFFELEC (Université de Montpellier), Registration is open here: https://www.math.sciences.univ-nantes.fr/journees-de-basse-dimension/ Due to the limited number of places, registration will be confirmed later on. Do not hesitate to suggest contributed talks to enrich the program and do not hesitate to contact us if you have any questions. Looking forward to seeing you in Nantes, The organizers (M. Golla, E. Wagner)

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seminario Romeo Segnan Dalmasso
by Diego Conti 21 May '24

21 May '24

Buongiorno, segnalo che giovedì 23 maggio alle 14.30 in aula seminari Romeo Segnan Dalmasso (Università di Milano Bicocca) terrà un seminario dal titolo *Harmful structures and Killing spinors* di cui riporto l'abstract: The existence of Killing spinors on a given manifold imposes strict conditions on its geometry. In the Riemannian setting in particular, this implies, for example, that the metric is Einstein. In the pseudo-Riemannian setting, the situation is less studied, nor as strict, for instance the metric need not be Einstein. In this talk, after an introduction to the language of spinors and some history concerning their study, I will present a new result concerning the existence of a Killing spinor on a pseudo-Riemannian manifold (Z, h). I will show that the existence on (Z, h) implies the existence of a pair of spinors (\psi, \phi) in the spinor bundle of an embedded (non-degenerate) hypersurface (M, g) satisfying a coupled PDE system involving the Weingarten operator of the embedding A, which will be called real or imaginary weakly /harmful structure/, depending on the signature of the normal vector-field to (M, g). The embedding process will require an additional technical condition, namely d tr A+\delta A = 0, and the assumption that the metric and the Weingarten operator are real analytic tensors. Some comments will be given on the special case of Lorentzian signature. Finally, I will present some work in progress regarding a (partial) classification in low dimension of harmful structures on homogeneous manifolds and the resulting cohomogeneity-one embeddings. This talk is based on a joint work with D. Conti and F.A. Rossi. A presto Diego

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Pranzo con lo speaker
by Carlo Collari 15 May '24

15 May '24

Buon pomeriggio, Lo speaker potrebbe non fare in tempo ad arrivare per pranzo. Per cui, con gli interessati ci vedremo direttamente al seminario. A presto, Carlo

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Seminario di Geometria del 16/05
by Carlo Collari 15 May '24

15 May '24

Buongiorno, Vi scrivo per ricordarvi che domani 16 Maggio, in Aula Seminari alle 14:30, Domenico Fiorenza (Sapienza Università di Roma) terrà il seminario dal titolo: * Projective 2-representations of linear Lagrangian correspondences* di cui riporto l'abstract: As recently illustrated by Ludewig and Roos, second quantization of fermions, i.e., the algebraic construction associating with a quadratic vector space its Clifford algebra and to a Lagrangian relation its exterior algebra (the Fock module) is an anomalous functor with values in the 2-category of algebras, bimodules and bimodule morphisms, with anomaly given by determinant lines. This can be equivalently seen as a projective 2-representation of the category of Lagrangian relations. By analogy to what happens with projective representations of groups, this suggests that suitable 2-central extensions of the category of Lagrangian relations should lift this projective 2-representation to an actual, i.e., non-anomalous, 2-representation. This makes the generalized Lagrangian relations considered by Stolz and Teichner naturally appear. Based on joint work in progress with Chetan Vuppulury. Per chi fosse interessato ad andare a pranzo con lo speaker ci troveremo per l'una e mezza in atrio. A presto, Carlo

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I: Postdoc at Lancaster
by Paolo Lisca 08 May '24

08 May '24

Inoltro annuncio di posizione post-doc. Paolo Lisca ________________________________ Da: Evans, Jonny <j.d.evans(a)lancaster.ac.uk> Inviato: mercoledì 8 maggio 2024 11:44 A: Evans, Jonny Oggetto: Postdoc at Lancaster Dear all, We are advertising a 20-month postdoc position in geometry at Lancaster University (UK). This is associated with the EPSRC grant "Frontiers in Symplectic Topology" which is led jointly by me (Jonny Evans, at Lancaster) and YankI Lekili (at Imperial). The grant is about exploring connections between symplectic geometry, algebraic geometry and low-dimensional topology, but eclecticism is welcomed, and people working in other flavours of geometry and topology are also encouraged to apply. The application deadline is 12th June. The position will be available as early as July, but with the possibility of starting later (e.g. September/October) if that's more convenient. If you know anybody who might be interested in applying, they can do so here: https://hr-jobs.lancs.ac.uk/Vacancy.aspx?ref=0593-24 Regards, Jonny Evans

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Seminario di geometria 9 maggio
by Filippo Bianchi 07 May '24

07 May '24

Carə tuttə, Il seminario di geometria di questa settimana si terrà Giovedì 9 Maggio alle 16.00 in Aula Seminari. Peter Smillie (Universität Heidelberg) parlerà di "Big minimal surfaces in symmetric spaces". Di seguito l'abstract. A well-known collection of problems in differential geometry reduce to the study of minimal surfaces in Riemannian symmetric spaces of non-compact type. In general, the derivative of the inclusion of a minimal surface is a holomorphic section of a certain vector bundle — what is special about symmetric spaces is that one can often recreate the minimal surface from this holomorphic data, through what is called the non-Abelian Hodge correspondence. This often lets you describe the moduli space of all minimal surfaces in an interesting way. However, this process of recreating the minimal surface still involves solving an elliptic PDE, and so precise questions require elliptic estimates. In this talk, I will try to describe the idea behind the basic interior estimate of Mochizuki and Simpson and some of its applications, and also tell you about a new version of this estimate with weaker hypotheses and weaker conclusions. This is work in progress with Nathanial Sagman. Ci troveremo alle 13 in atrio per andare a pranzo con lo speaker. Vi segnalo anche il seminario di Combinatoria, Teoria di Lie e Topologia di giovedì 9 maggio, potenzialmente interessante per alcuni membri del gruppo: alle 14.45 in Aula Magna Andrei Neguţ (MIT) parlerà di "Braids and coherent sheaves". Di seguito l'abstract: We will present a conjecture relating the affine Hecke category (an algebraic incarnation of annular braids) to coherent sheaves on the commuting variety. Joint work with Eugene Gorsky. This is an affine version of the conjecture (now a theorem) we proposed with Jacob Rasmussen that relates Khovanov homology to coherent sheaves on Hilbert schemes. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/en/seminars/?category=653b522f8f0af760bdc42729>. Vi aspettiamo! Buona serata, Filippo, Giovanni e Giuseppe

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Fwd: Postdoc position at Università di Firenze
by Bruno Martelli 24 Apr '24

24 Apr '24

---------- Forwarded message --------- Da: Daniele Angella <daniele.angella(a)unifi.it> Date: Mer 24 Apr 2024, 08:10 Subject: Postdoc position at Università di Firenze To: geometriaglobale-group(a)unifi.it <geometriaglobale-group(a)unifi.it>, dimai-geometria-group(a)unifi.it <dimai-geometria-group(a)unifi.it>, GEOMETRY(a)listserv.utk.edu <GEOMETRY(a)listserv.utk.edu>, EAGER-GEN(a)listserv.dfn.de <EAGER-GEN(a)listserv.dfn.de> Dear all, We are looking for candidates for a Postdoc position at Università di Firenze, Italy, starting from September 2024. The position is funded by the PRIN2022 Project "Real and Complex Manifolds: Geometry and holomorphic dynamics". The call is open until the deadline June 20th, 2024: https://titulus.unifi.it/albo/viewer?view=files%2F005484724-UNFICLE-93897a4… Please forward the announcement to potential candidates! All the best, daniele

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I: Seminario baby geometri
by Giovanni Framba 22 Apr '24

22 Apr '24

Dato che il seminario di geometria è stato annullato, condivido l'invito al seminario dei BabyGs. Vi aspettiamo, Giovanni ________________________________ Da: Giovanni Framba via Dottorandi <dottorandi(a)lists.dm.unipi.it> Inviato: lunedì 22 aprile 2024 21:32 A: Studenti <studenti(a)dm.unipi.it>; dottorandi(a)dm.unipi.it <dottorandi(a)dm.unipi.it>; babygs-users(a)googlegroups.com <babygs-users(a)googlegroups.com> Oggetto: [dottorato] Seminario baby geometri Carə tuttə, Il seminario dei baby geometri di questa settimana si terrà domani Martedì 23 Aprile alle 14.30 in Aula Riunioni. Manousos Manouras (Université de Pau / Universidad de Zaragoza) parlerà di "Alexander type invariants of line arrangements". Di seguito l'abstract. There have been various definitions of the Alexander invariants of a knot. Following some of these definitions one can generalise them so as to have coefficients twisted by a linear representation. The Alexander type invariants are known to detect non-trivial topological information(genus, hyperbolic volume of a knot etc). The twisted Alexander polynomial was introduced by Wada for knots and has been studied thereafter for more general manifolds as the complement of algebraic curves or line arrangements. We will discuss the relation of the twisted Alexander polynomial of the exterior manifold of a line arrangement and the twisted Alexander polynomial of its boundary manifold. We will present how using twisted Alexander polynomials induced by reducible representations, we can retract nontrivial topological information. We will also deal with the characteristic varieties of line arrangements, studied by various authors such as Zariski, Libgober, Artal. The main problem is to understand if the characteristic varieties are combinatorially determined in general. This is known to be true for their ”homogeneous part”, which corresponds to the resonance variety, as well as for the translated components having dimension at least one, as they are determined by orbifold pencils. This does not work in the same way for the 0-dimensional translated components. Here we present examples such that the characteristic variety has some translated 0-dimensional global component. Ci troveremo alle 13 in atrio per andare a pranzo con lo speaker. Le informazioni sui prossimi seminari si trovano sul sito dei Baby Geometri! Vi aspettiamo! Buona serata, Filippo, Giovanni e Giuseppe

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Seminario di geometria 23/04
by Filippo Bianchi 22 Apr '24

22 Apr '24

Carə tuttə, Il seminario di geometria di questa settimana si terrà domani Martedì 23 Aprile alle 14.30 in Aula Riunioni. Isaac Sundberg (MPIM Bonn) parlerà di "Khovanov homology and surfaces in the 4-ball". Di seguito l'abstract. It is difficult to detect differences between topological and smooth phenomena, so it was surprising when Rasmussen used a purely combinatorial theory, known as Khovanov homology, to obstruct the smooth sliceness of topologically slice knots. In this talk, we discuss another application of this homology theory: obstructing smooth isotopy of topologically isotopic surfaces in the 4-ball. We highlight recent results and give an idea of the construction for this obstruction. Ci troveremo alle 13 in atrio per andare a pranzo con lə speaker. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/en/seminars/?category=653b522f8f0af760bdc42729>. Vi aspettiamo! Buona serata, Filippo, Giovanni e Giuseppe

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Seminario di geometria 15/04
by Filippo Bianchi 14 Apr '24

14 Apr '24

Carə tuttə, Il seminario di geometria della prossima settimana si terrà eccezionalmente domani Lunedì 15 Aprile alle 11.00 in Aula Magna. Marco Golla (Université de Nantes) parlerà di "Line arrangements with only triple points". Di seguito l'abstract. Line arrangements are unions of lines in a (projective or affine) space over some field and they are studied from a combinatorial or algebro-geometrical standpoint. (Non-trivial) complex line arrangements always have at least a double or a triple point, a point where exactly two or three lines meet. Does there exist 13 lines in the complex projective plane that only meet at triple points? I will discuss some topological ideas around this question and higher-degree variants. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/en/seminars/?category=653b522f8f0af760bdc42729>. Vi aspettiamo! Buona serata, Filippo, Giovanni e Giuseppe

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I: Conference in low-dimensional topology - Budapest 8th-12th July 2024
by Paolo Lisca 10 Apr '24

10 Apr '24

Inoltro annuncio di convegno di topologia in bassa dimensione. Paolo Lisca ________________________________ Da: marengon <marengon.marco(a)renyi.hu> Inviato: mercoledì 10 aprile 2024 01:18 A: New.Structures Low.Dimensional.Topology Oggetto: Conference in low-dimensional topology - Budapest 8th-12th July 2024 Dear colleague, We would like to advertise a conference in low-dimensional topology, organized by the Simons collaboration "New structures in low-dimensional topology", which will take place at the Rényi Institute in Budapest (Hungary) on the week of 8th-12th July 2024. The target audience of the summer school includes advanced graduate students, postdocs, and established researchers. See https://erdoscenter.renyi.hu/events/conference-new-structures-low-dimension… for more information. We have limited funding to support some junior participants as well as limited space. Registration and application for funding is now open at the above link. The deadline for application is 25th April 2024. Please forward this message to anyone who might be interested in applying. Our best wishes, The organizers

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Seminario di geometria 11/04
by Filippo Bianchi 09 Apr '24

09 Apr '24

Carə tuttə, Giovedì 11 Aprile alle 14.30 in Aula Seminari si terrà il seminario di Michael Brandenbursky (Ben Gurion University of the Negev) dal titolo "Invariant norms on diffeomorphism groups: old and new results". Di seguito l'abstract. Invariant norms appear in most branches of mathematics. Examples include word norms (autonomous, entropy, fragmentation) and non-discrete norms (Hofer norm) in symplectic geometry. In group theory examples include commutator length and primitive length. After providing some history and motivation, I will focus on a group G of volume-preserving diffeomorphisms of a compact smooth orientable manifold. In particular, I will discuss L^p-geometry of this group and which groups can be quasi-isometrically embedded in G. This talk is partially based on a joint work with M. Marcinkowski and E. Shelukhin. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/en/seminars/?category=653b522f8f0af760bdc42729>. Come sempre, ci troveremo in atrio alle 13 per andare a pranzo con lo speaker. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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Seminario Paolo Ghiggini domani
by Bruno Martelli 03 Apr '24

03 Apr '24

Buongiorno, Con colpevole ritardo segnalo il seminario di geometria di domani (ore 14.30 aula seminari). A presto, Bruno ----- Orbite di Reeb e invarianti di varietà suturate Paolo Ghiggini Giovedì 4 apr 2024 - 14:30 Aula Seminari (Department of Mathematics) Le orbite chiuse del flusso di Reeb di una forma di contatto producono un invariante topologico di varietà di dimensione tre detto "omologia di contatto immersa" definito da Michael Hutchings circa vent'anni fa. In seguito la definizione è stata estesa alle varietà suturate (cioè con bordo decorato da una multicurva) da Vincent Colin, Ko Honda, Michael Hutchings e me. D'altra parte l'omologia di Heegaard Floer di Ozsváth e Szabó è stata estesa alle varietà suturate da András Juhász. Nel mio seminario spiegherò i punti chiave della dimostrazione che l'omologia di Heegaard Floer e l'omologia di contatto immersa di varietà suturate sono isomorfe. Questo risultato generalizza (e utilizza) l'isomorfismo tra l'omologia di Heegaard Floer e l'omologia di contatto immersa per varietà chiuse dimostrato anni or sono da Colin, Honda e me. Tutto quello che racconterò è stato ottenuto in collaborazione con Colin e Honda.

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Seminario di geometria 26/03
by Filippo Bianchi 26 Mar '24

26 Mar '24

Carə tuttə, Il seminario di geometria di questa settimana si terrà eccezionalmente domani martedì 26 Marzo in Saletta Riunioni alle 14.30. Tanushree Shah (Universität Wien) parlerà di "Contact structures on 3-manifolds". Di seguito l'abstract. I will start by introducing contact structures. They come in two flavors: tight and overtwisted. Classification of overtwisted contact structures is well understood as opposed to tight contact structures. Tight contact structures have been classified on very few 3-manifolds. We will look at what more classification results can we hope to get using the current techniques and what is far-fetched. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/en/seminars/?category=653b522f8f0af760bdc42729>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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I: scuola +workshop a Roma, Nov 2024
by Paolo Lisca 20 Mar '24

20 Mar '24

Trasmetto un annuncio di scuola/workshop a Roma-Sapienza a novembre 2024. https://sites.google.com/view/cga-rome/home Paolo Lisca

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Seminari di geometria 21/03
by Filippo Bianchi 19 Mar '24

19 Mar '24

Carə tuttə, Giovedì 21 Marzo ci saranno due seminari di geometria, entrambi in Aula Seminari. Alle 11, Clara Löh (Universität Regensburg) parlerà di "A quadratic lower bound on the number of minimal gedesics". Di seguito l'abstract. A minimal geodesic on a Riemannian manifold is a geodesic line that lifts to a globally isometric geodesic line on the universal covering. Bangert proved that there is a lower bound for the number of geometrically distinct minimal geodesics of closed Riemannian manifolds that is linear in the first Betti number, using the stable norm ball on the first homology. We refine this method to obtain a quadratic lower bound. This is based on joint work with Bernd Ammann (Regensburg). Alle 14.30, Keegan Boyle (University of British Columbia) parlerà di "Alexander polynomials and symmetric knots". Di seguito l'abstract. In this talk I will discuss the extra topological information which can be extracted from the Alexander polynomial of a knot in S^3 in the case where there are certain types of symmetry on the knot. Specifically, I will discuss 2-periodic, strongly invertible, and strongly negative amphichiral knots. I will mention join work with Ahmad Issa, with Wenzhao Chen, and with Nicholas Rouse and Ben Williams. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/en/seminars/?category=653b522f8f0af760bdc42729>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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I: postdoc at Shenzhen International Center for Mathematics - SUSTech
by Paolo Lisca 20 Feb '24

20 Feb '24

Da: Pedro Salomão <psalomao(a)gmail.com> Inviato: martedì 20 febbraio 2024 06:26 Oggetto: postdoc at Shenzhen International Center for Mathematics - SUSTech Dear colleague, I am writing to advertise two postdoc positions in Symplectic Dynamics at Shenzhen International Center for Mathematics - SUStech. The position begins in Fall 2024. The announcement is available at https://icm.sustech.edu.cn/jobs/phd/2023-11-28.html?lang=en-us Please circulate this information to anyone who might be interested. Many thanks. Pedro Salomao

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Conference "Combinatorial and Gauge theoretical methods in low dimensional topology and geometry"
by Bruno Martelli 15 Feb '24

15 Feb '24

Dear colleagues, We are pleased to announce the conference *Combinatorial and Gauge theoretical methods in low dimensional topology and geometry* *- A conference in honour of Paolo Lisca's 60th birthday* De Giorgi Center, Pisa (Italy), June 3 -- June 7, 2024. Web page: http://www.crm.sns.it/event/519/ Note that the *registration is already open*, with a 31st of March general deadline, and a 15th of March deadline for early career researchers who are applying for funding. *Confirmed speakers:* Antonio Alfieri (CRM-ISM) Akram Alishahi (University of Georgia at Athens) Agnese Barbensi (Queensland) Daniele Celoria (Queensland) Marco Golla (Nantes) Joshua Greene (Boston College) Siddhi Krishna (Columbia) Francesco Lin (Columbia) Bruno Martelli (Pisa) Gordana Matić (Athens) Alice Merz (Lille) Brendan Owens (Glasgow) Jung Huan Park (KAIST) Steven Sivek (Imperial College) Laura Starkston (UC Davis) András Stipsicz (Rényi) Luya Wang (Stanford) *Scientific committee:* Gordana Matić (University of Georgia, Athens) Tomasz Mrowka (MIT) Peter Ozsváth (Princeton) Pisa is a very touristic city, with many cultural events organized during the month of June. We strongly encourage you to plan your trip and hotel as early as possible. *Please forward this information to anyone who might be interested.* The organising committee, Paolo Aceto, Paolo Ghiggini, Ana G. Lecuona, Francesco Lin, Bruno Martelli

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I: One year postdoctoral position at ULB
by Paolo Lisca 09 Feb '24

09 Feb '24

________________________________ Da: Mélanie Bertelson <melanie.bertelson(a)gmail.com> Inviato: venerdì 9 febbraio 2024 12:47 Oggetto: On year postdoctoral position at ULB Dear Colleagues, The Department of Mathematics of the ULB (Université libre de Bruxelles) is opening a one year postdoctoral position with teaching to start on October 1st 2024 with a possible extension by one year. The candidates should be fluent in French. More details can be found in the document attached. Please forward to whoever might be interested. Best wishes, Mélanie

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I: Summer school on GW invariants - Nantes - 11th-14th june 2024
by Paolo Lisca 07 Feb '24

07 Feb '24

Da: Erwan Brugallé <Erwan.Brugalle(a)math.cnrs.fr> Inviato: martedì 6 febbraio 2024 15:25 A: Erwan Brugallé Oggetto: Fwd: Summer school on GW invariants - Nantes - 11th-14th june 2024 -------- Message transféré -------- Dear friends and colleagues, We are pleased to announce a summer school in University of Nantes, on the topic of Gromov-Witten invariants, which will take place from 11th to 14th of June 2024. The topic is Gromov-Witten invariants, as seen both from algebraic geometric and symplectic topological viewpoints. The school is aimed at Master students and early PhDs, and mainly revolves around two mini-courses, of 5 hours in total each. One of these is offered by Amanda Hirschi and will describe the definition and use of these invariants in symplectic topology; the other will be given by Jérémy Guéré and will instead focus on the algebraic geometric side of the topic. In addition to the minicourses, there will also be two accompanying talks, to give more details about some symplectic and algebraic aspects. The schedule is light in order to leave enough time to the participants to discuss and work together over the content of the lectures, and more generally to discover each other's research interests. In particular, besides the planned invited talks, we very much welcome any short contributed talk by those participants who would like to explain their research in the context of this school. All the information, including the registration form, can be found at: https://fabiogironella.com/events/24_06_summer_school_nantes_gw_invariants/…<https://fabiogironella.com/events/24_06_summer_school_nantes_gw_invariants/…> Please forward this announcement to master and PhD students that may be interested in attending our summer school. Best regards, Fabio Gironella and Stéphane Guillermou (the organizers)

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Seminario Motegi giovedì
by Bruno Martelli 06 Feb '24

06 Feb '24

Buondì, Vorrei segnalare il seminario di topologia di giovedì prossimo. A presto, Bruno --- Thursday, Feb 8, 2024 14:30 -- 15:30 Aula Seminari Kimihiko Motegi (Nihon University) Titolo: Dehn filling and knot group Abstract: consultabile al link https://www.dm.unipi.it/en/seminar/?id=65a65946f54ae11f66d65da7

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Manifolds and Groups in Bologna, II
by Bruno Martelli 06 Feb '24

06 Feb '24

Dear all, we are pleased to announce the following event: Manifolds and Groups in Bologna, II ----------------------------------------- Date: Wednesday, Apr 17, 2024 -- Friday, Apr 19, 2024 Place: University of Bologna The aim of this workshop is to bring together young researchers working in low-dimensional topology and geometric group theory in a broad sense. The event consists in main lectures and shorter talks in order to give the opportunity to young researchers to present their own research. The workshop is hosted by the University of Bologna and it is sponsored by the GNSAGA (INdAM), PRIN "Geometry and Topology of Manifolds", Dipartimento di Matematica (Università di Bologna). Main speakers: Monika Kudlinksa (University of Oxford), Kevin Li (University of Regensburg), Maria Beatrice Pozzetti (University of Heidelberg), George Raptis (University of Regensburg), Davide Spriano (University of Oxford), Paula Truöl (MPIM Bonn). Junior speakers: Giuseppe Bargagnati (University of Pisa), Pietro Capovilla (SNS Pisa), Paolo Cavicchioli (University of Bologna), Jacopo Guoyi Chen (SNS Pisa), Gemma Di Petrillo (University of Trento), Martina Jørgensen (ETH Zurich), Giorgio Mangioni (Heriot-Watt University), Alice Merz (University of Pisa), Edoardo Rizzi (SNS Pisa), Anna Roig Sanchis (Sorbonne University), Matthias Uschold (University of Regensburg). website: https://math.unibo.it/en/events/manifolds-and-groups-in-bologna-2024 Looking forward to seeing you in Bologna, Marco Moraschini, Stefano Riolo and Filippo Sarti (University di Bologna)

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Fwd: Summer school - Low-dimensional Topology - Budapest 1-5 July 2024
by Bruno Martelli 01 Feb '24

01 Feb '24

---------- Messaggio inoltrato --------- Da: marengon <marengon(a)renyi.hu> Data: gio 1 feb 2024 alle 10:46 Oggetto: Summer school - Low-dimensional Topology - Budapest 1-5 July 2024 A: Dear colleague, We would like to advertise a *Summer School* in *low-dimensional topology*, organized by the Simons collaboration "New structures in low-dimensional topology", which will take place at the * Rényi Institute* in *Budapest (Hungary)* on the week of *1st-5th July 2024*. The main target audience of the summer school are PhD students. See https://erdoscenter.renyi.hu/events/summer-school-new-structures-low-dimens… for more information. We have limited funding to support some junior participants as well as limited space. Registration and application for funding is now open at the above link. The deadline for application is * 15th March 2024*. Please forward this message to anyone who might be interested in applying. Our best wishes, The organizers Sergei Gukov, Aaron Lauda, Marco Marengon, Tom Mrowka, Peter Ozsváth, András Stipsicz, Zoltán Szabó

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YGGT 2024
by Bruno Martelli 15 Jan '24

15 Jan '24

Ricevo ed inoltro, Bruno ---- Dear all, This is a reminder that registration for the 12th edition of Young Geometric Group Theory (YGGT XII) is currently open. The registration form and instructions can be found on the conference website: https://sites.google.com/view/yggt2024. The closing date is *19th January 2024*. We would encourage you to pass this information on to any PhD student, masters student, or postdoc who might be interested in attending, but who might not be on this mailing list. YGGT is a series of annual conferences which were initiated in 2012, with the aim of allowing early-career researchers in geometric group theory from all over the world to meet, forge new connections and, of course, learn more about geometric group theory. The 12th edition will take place *from the 8th to 12th of April 2024* in Bristol, UK. Best regards, Alice Kerr, Davide Spriano, Rylee Alanza Lyman, Vladimir Vankov

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I: 4-year PhD position in Differential Topology in Utrecht (Netherlands)
by Paolo Lisca 25 Dec '23

25 Dec '23

Da: Pino Gomez, A. del (Alvaro) <a.delpinogomez(a)uu.nl> Inviato: lunedì 18 dicembre 2023 18:00 A: Alvaro del Pino Gómez Oggetto: 4-year PhD position in Differential Topology in Utrecht (Netherlands) Dear friends and colleagues, I am advertising a 4-year PhD position in Differential Topology/Geometry in Utrecht University (Netherlands), to start no later than September 2024. The research project will deal with the classification of geometric structures up to homotopy. More concretely, it will focus on the use of h-principle techniques to classify tangent distributions (although there is room to adapt the concrete goals to the taste of the PhD candidate). The math department in Utrecht is very nice and lively. A list of members can be found here: https://utrechtgeometrycentre.nl/members/ The candidate will interact mostly with our Algebraic Topology and Differential Geometry groups. If this sounds attractive to you, you can apply here: https://www.uu.nl/en/organisation/working-at-utrecht-university/jobs/phd-po… The deadline is 8th January 2024. Moreover, feel free to forward this application to potential applicants. All the best! Álvaro del Pino

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Fwd: Postdoc at SISSA
by Bruno Martelli 21 Dec '23

21 Dec '23

---------- Forwarded message --------- Da: Rafael Torres <rtorres(a)sissa.it> Date: Mer 20 Dic 2023, 17:17 Subject: Postdoc. To: Bruno Martelli <bruno.martelli(a)unipi.it> Dear Bruno, hope all is well with you. There's a 3 years postdoc position here in SISSA https://www.sissa.it/bandi/sissa-mathematical-fellowships with 12/02/2024 as a deadline to submit the application. Perhaps you might know someone who's interested to come over. Happy holidays, Rafael

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Fwd: [gdrtresses] Post-Doctoral Position Dijon
by Bruno Martelli 20 Dec '23

20 Dec '23

---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Wed, Dec 20, 2023 at 11:14 AM Subject: [gdrtresses] Post-Doctoral Position Dijon To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> Dear all, The Institut de Mathématiques de Bourgogne (IMB) at the University of Burgundy in Dijon advertizes a two-year postdoctoral position within the ANR project ANR-22-CPJ1-0001-0. We are looking for candidates working at the intersection of low-dimensional topology, algebra and mathematical physics, with interest in topological field theories and adjacent areas (broadly understood). The position starts in October 2024. More details and information on how to apply can be found here: https://math.u-bourgogne.fr/wp-content/uploads/2023/12/postdoc_Woike_annonc… Thank you for forwarding this message to potential candidates. Do not hesitate to contact me in case of questions. Best wishes, Lukas Woike

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Seminario di geometria 21/12
by Filippo Bianchi 19 Dec '23

19 Dec '23

Carə tuttə, Giovedì 21 Dicembre alle 14.30 in Aula Seminari si terrà il seminario di Marco De Renzi (Université de Montpellier) dal titolo "Algebraic presentation of cobordisms and TQFTs". Di seguito l'abstract. It has long been known that the category of 2-dimensional cobordisms is freely generated by a commutative Frobenius algebra, the circle. This result allows for a complete classification of TQFTs (Topological Quantum Field Theories) in dimension 2. In this talk I will discuss similar algebraic presentations in dimension 3 and 4 due to Bobtcheva and Piergallini. In both cases, the fundamental algebraic structures are provided by certain Hopf algebras called BPH algebras. I will also present examples of such algebras and the TQFTs they induce. This is a joint work with A. Beliakova, I. Bobtcheva, and R. Piergallini. Ci troveremo alle 13 in atrio per andare a pranzo. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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Fwd: Announcement post doc position in L'Aquila
by Bruno Martelli 14 Dec '23

14 Dec '23

---------- Forwarded message --------- Da: Giuseppe Pipoli <giuseppe.pipoli(a)univaq.it> Date: Gio 14 Dic 2023, 17:33 Subject: Announcement post doc position in L'Aquila To: Dear Colleague, We are pleased to announce a one-year postdoctoral position (Assegno di Ricerca) in L'Aquila. The position is funded by the PRIN project "Differential-geometric Aspects of Manifolds via Global Analysis." The salary is approximately €1450 after taxes, with the possibility of renewal for a second year. The research will focus on Riemannian and Complex Geometry and Geometric Analysis. Topics of particular interest include the geometry of Riemannian submanifolds whose curvature satisfies specific equations or geometric properties, their evolution through geometric flows, geometric flows of Riemannian and Complex manifolds, classifications of geometric structures on real and complex manifolds, and isoperimetric inequalities on manifolds and Riemannian submanifolds. The call is available at - * https://bandi.miur.it/bandi.php/public/fellowship/id_fellow/250798 <https://bandi.miur.it/bandi.php/public/fellowship/id_fellow/250798>* - *https://www.univaq.it/include/utilities/blob.php?table=assegni_ricerca&id=892&item=bando <https://www.univaq.it/include/utilities/blob.php?table=assegni_ricerca&id=8…>* You can apply online at *https://pica.cineca.it/univaq/disim-2023-ar-11/ <https://pica.cineca.it/univaq/disim-2023-ar-11/>* I would be grateful if you would spread this message to all potentially interested people. For any further information, please feel free to contact *giuseppe.pipoli(a)univaq.it <giuseppe.pipoli(a)univaq.it>* Best regards, Giuseppe Pipoli

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Seminario Baby Geometri 13/12
by Giovanni Framba 12 Dec '23

12 Dec '23

Carə tuttə, Vi invitiamo al seminario dei Baby Geometri di questa settimana: Mercoledì 13 Dicembre 2023, alle ore 14:30 Presso l’Aula Riunioni (Dipartimento di Matematica) Gemma Di Petrillo (Università di Trento) terrà un seminario dal titolo: Quaternions and isometries of the hyperbolic 5-space di cui riporto l'abstract: It is a well-known fact that the group of orientation-preserving isometries of the hyperbolic n-space is isomorphic to the matrix group SO^+(n,1). When n=2 and n=3, these groups have a "friendlier" description as the 2x2 matrix groups PSL(2,R) and PSL(2,C). By identifying R^4 with the quaternion algebra H, we will see that something similar happens in the n=5 case: more precisely, we will show that SO^+(5,1) is isomorphic to PSL(2,H) - the space of 2x2 quaternionic matrices with Dieudonné determinant equal to 1. At the end of the talk, I will give an idea on how these results can be applied to try and understand deformations of complete hyperbolic 3-manifolds (with finite volume) in the 5-dimensional hyperbolic space. This is based on a joint work with Bruno Martelli. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito https://sites.google.com/view/babygeometri [https://lh5.googleusercontent.com/CtqlqJpO6ZXiyBenfbgtGLv_DkKlGOpGCBByGwXOD…]<https://sites.google.com/view/babygeometri> Seminari dei Baby Geometri<https://sites.google.com/view/babygeometri> I Baby Geometri sono un ciclo di seminari di Geometria e Topologia organizzati dai dottorandi dell'Università di Pisa (UNIPI) e perfezionandi della Scuola Normale Superiore di Pisa (SNS). Si tratta di seminari informali su argomenti classici oppure tematiche di ricerca. Poiché il pubblico è sites.google.com . Tutte le persone interessate sono invitate a partecipare. A presto, Filippo Bianchi Pietro Capovilla Giovanni Framba

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Fwd: Bando AdR "Geometria di gruppi e varietà"
by Bruno Martelli 11 Dec '23

11 Dec '23

Segnalo un assegno a Bologna del nostro PRIN. Non è necessario il titolo di dottorato per partecipare. Bruno ---------- Forwarded message --------- Buongiorno a tutti, vi comunico che il bando AdR dal titolo “Geometria di gruppi e varietà” è stato pubblicato e potete trovarlo al seguente link: https://bandi.unibo.it/ricerca/assegni-ricerca?id_bando=67245 . Cordiali saluti, Emanuela Emanuela Pungetti *Area amministrativa* ARCES - Centro di Ricerca sui Sistemi Elettronici per l’Ingegneria dell’Informazione e delle Telecomunicazioni “Ercole De Castro” *Alma Mater Studiorum - Università di Bologna* Via V. Toffano 2/2 - 40125 Bologna Tel.: 051 20 84201

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Seminario di Geometria 7/12
by Filippo Bianchi 06 Dec '23

06 Dec '23

Carə tuttə, Giovedì 7 Dicembre alle 14.30 in Aula Seminari si terrà il seminario di Carlo Collari (Università di Pisa) dal titolo "Strongly Invertible Legendrian Links". Di seguito l'abstract. In this talk I will introduce strongly invertible Legendrian links in the standard contact three-dimensional space. After a short presentation of the equivariant analogues of well-known theorems for both strongly invertible and Legendrian links, e.g. the equivariant Legendrian Reidemeister theorem, I will introduce the maximal equivariant Thurston-Bennequin number. I will conclude the talk discussing some experimental results and conjectures concerning the maximal equivariant Thurston-Bennequin number. This is joint work with Paolo Lisca (Università di Pisa). Ci troveremo alle 13 in atrio per andare a pranzo. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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Fwd: Bando di concorso Assegni di Ricerca Post dottorali INdAM
by Bruno Martelli 29 Nov '23

29 Nov '23

---------- Forwarded message --------- Da: ISTITUTO NAZIONALE DI ALTA MATEMATICA <indam(a)altamatematica.it> Date: Mer 29 Nov 2023, 16:41 Subject: Bando di concorso Assegni di Ricerca Post dottorali INdAM To: gnampa-aderenti(a)altamatematica.it <gnampa-aderenti(a)altamatematica.it>, gncs-aderenti(a)altamatematica.it <gncs-aderenti(a)altamatematica.it>, gnfm-aderenti(a)altamatematica.it <gnfm-aderenti(a)altamatematica.it>, gnsaga-aderenti(a)altamatematica.it <gnsaga-aderenti(a)altamatematica.it> Care Colleghe, Cari Colleghi, alla pagina del sito dell’Istituto https://www.altamatematica.it/blog/2023/11/29/bando-di-concorso-a-n-8-asseg… è disponibile un* Bando di concorso a n. 8 assegni post dottorali di collaborazione ad attività di* *ricerca per l'a.a. 2023-2024 *pubblicato sulla Gazzetta Ufficiale 4a Serie Speciale – Concorsi ed Esami n. 91 del 28 novembre 2023. Gli assegni hanno una durata *annuale e sono rinnovabili per un ulteriore anno*. All’assegnista sarà corrisposta una somma pari a *€ 35.000 lordi annui*. Inoltre, l’assegnista disporrà di un fondo di ricerca pari a *€* *2.500,00 netti annui*. Al concorso possono partecipare giovani attivi nella ricerca matematica che abbiano conseguito il titolo di dottore di ricerca o titolo equipollente o un titolo di studio rilasciato da un’Università straniera comparabile al titolo di dottore di ricerca dopo il 1 gennaio 2023 o che lo conseguano entro il 31 maggio 2024. Le domande dovranno essere presentate entro il *28 dicembre 2023* esclusivamente mediante apposita modulistica elettronica predisposta all'interno del sito WEB dell'INdAM: https://www.altamatematica.it/. Cordiali saluti, Giorgio Patrizio Presidente INdAM [image: image.png]

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Seminario di Geometria 30/11
by Filippo Bianchi 28 Nov '23

28 Nov '23

Carə tuttə, Giovedì 30 Novembre alle 14.30 in Aula Seminari si terrà il seminario di James Farre (Universität Heidelberg) dal titolo "Horospheres, Lipschitz maps, and laminations". Di seguito l'abstract. Every horocycle in a closed hyperbolic surface is dense, which was proved by Hedlund in the 1940's. We study the behavior of horocycle orbit closures in Z-covers of closed surfaces, and obtain a fairly complete classification of their topology and geometry. The main tool is a solution of a surprisingly delicate geometric optimization problem: finding an optimal Lipschitz map to the circle in a given homotopy class and the associated lamination of maximal stretch. I will explain the relationship between these two problems, and if time permits, I will give a novel construction of optimal circle valued Lipschitz maps using the orthogeodesic foliation construction. This is joint work with Yair Minsky and Or Landesberg featuring joint work with Aaron Calderon. Ci troveremo alle 13 in atrio per andare a pranzo con James. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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Fwd: Postdoctoral position
by Bruno Martelli 17 Nov '23

17 Nov '23

---------- Forwarded message --------- Da: Federica <federica.fanoni(a)gmail.com> Date: Ven 17 Nov 2023, 10:00 Subject: Postdoctoral position To: Dear colleagues, I am writing to advertise a postdoctoral position at the UPEC, with me as a mentor. The contract is for a year, starting in summer/autumn 2024, with possibility of renewal for two additional years. The deadline is January 15th. The official ad can be found here <https://emploi.cnrs.fr/Offres/CDD/UMR8050-FEDFAN-003/Default.aspx?lang=EN> (note that, while "experience required" is indicated to be 1 to 4 years, students who are currently finishing their PhD are welcome to apply). If you have any questions concerning the position, please feel free to contact me. Do not hesitate to forward this message to any potential candidate. Best regards, Federica Fanoni

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I: [mathlist] Two postdoc positions in symplectic and contact topology in France
by Paolo Lisca 16 Nov '23

16 Nov '23

________________________________ Da: mathlist-request(a)services.cnrs.fr <mathlist-request(a)services.cnrs.fr> per conto di Frédéric Bourgeois <mathlist(a)services.cnrs.fr> Inviato: giovedì 16 novembre 2023 16:58 A: mathlist(a)services.cnrs.fr Oggetto: [mathlist] Two postdoc positions in symplectic and contact topology in France Dear colleagues, We are writing to advertise two 1-year postdoctoral positions for Fall 2024 in symplectic/contact topology which can be held at several universities in France and are supported by ANR project COSY: https://www.mathjobs.org/jobs/list/23873 We would be grateful if you could forward this information to anyone who might be interested. Many thanks in advance, Frédéric Bourgeois (on behalf of the ANR project COSY as coordinator)

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Fwd: two postdoc positions
by Bruno Martelli 16 Nov '23

16 Nov '23

---------- Forwarded message --------- From: Marc Lackenby <lackenby(a)maths.ox.ac.uk> Date: Tue, Nov 14, 2023 at 12:04 PM Subject: two postdoc positions To: lackenby <lackenby(a)maths.ox.ac.uk> Dear colleagues, I would like to draw your attention to two postdoc positions in Oxford that we are currently advertising: https://www.maths.ox.ac.uk/node/65922 https://www.maths.ox.ac.uk/node/65923 The first of these is specifically in low-dimensional topology/geometry. They are 3-year positions with a very light teaching load. If you know of any good candidates, can you encourage them to apply. The deadline is 24 November. Thanks! Best wishes, Marc

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Fwd: European School of Differential Geometry: Granada June 24th to Jully 5th , 2024.
by Bruno Martelli 13 Nov '23

13 Nov '23

---------- Forwarded message --------- From: Barbara Nelli <barbara.nelli(a)univaq.it> Date: Sun, Nov 12, 2023 at 11:18 AM Subject: European School of Differential Geometry: Granada June 24th to Jully 5th , 2024. To: Barbara Nelli <barbara.nelli(a)univaq.it> Dear Colleague, as a board member, I am pleased to inform you about the European School of Differential Geometry http://imag.ugr.es/esdg/ that will be held in Granada (Spain) from June 24th to Jully 5th , 2024. The ESDG has been approved as a Satellite Event of the ECM2024-Sevilla. The realization of this type of event is essential to maintain the vitality of Differential Geometry in Europe. The ESDG target audience is focused on young researchers, as well as Master and Doctoral students involved in the area of Differential Geometry. The ESDG will encourage the cohesion of the different research groups in Europe, having significant effects on the development of Mathematics on the continent. The idea is to create a solid and resilient event, with a clear projection in the future. The ESDG will take place every two years, each occasion in a European country. Students attending the school will have the opportunity to apply for scholarships. All the information will be available in the school webpage. Please do not hesitate to ask for additional information. I would be grateful if you could actively promote the school to attract as many participants as possible. Sincerely, Barbara Nelli

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Fwd: Post-doc in Pavia
by Bruno Martelli 08 Nov '23

08 Nov '23

---------- Forwarded message --------- Da: Francesco Bonsante <bonfra07(a)unipv.it> Date: Mer 8 Nov 2023, 09:39 Subject: Post-doc in Pavia To: Francesco Bonsante <francesco.bonsante(a)unipv.it> Dear colleague, I would like to advertise a one-year post-doc position here in Pavia under my supervision. The position is supported by PRIN project “Geometry and topology of manifolds”. The theme of the research is “Geometric structures and surface group representations”. The call can be found here https://alboufficiale.unipv.it/files/004857952-UNPVCLE-dcaa4a66-c6e5-4b32-8… The deadline is *December 7, 2023 at 12:00 (local time)*. Unfortunately the call is only in Italian, but I can be contacted for any information. In principle the post-doc should start in April, but there is some flexibility to postpone the beginning of some months. Please forward this announcement to potentially interested candidates. Best regards, Francesco

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Seminario di geometria 09/11
by Filippo Bianchi 07 Nov '23

07 Nov '23

Carə tuttə, Giovedì 9 Novembre alle 14.30 in Aula Seminari si terrà il seminario di Hironobu Naoe (Chuo University) dal titolo "Shadow-complexity and trisection genus". Di seguito l'abstract. A shadow of a closed 4-manifold is a 2-complex suitably embedded in the 4-manifold, which can be treated as a combinatorial description of 4-manifolds. An invariant, called the shadow-complexity, of 4-manifolds is defined by counting certain vertices in shadows. On the other hand, a trisection is a decomposition of a 4-manifold into three handlebodies, and the intersection of the three handlebodies forms an orientable surface called the trisection surface. The trisection genus of a 4-manifold is defined as the minimum genus of all trisection surfaces. In this talk, we introduce a refined version of the shadow-complexity and give an inequality between the complexity and the trisection genus. Furthermore, we determine the complexity we introduced for some 4-manifolds. This is joint work with Masaki Ogawa. Ci troveremo alle 13 in atrio per andare a pranzo con Hironobu. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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Seminario di geometria 02/11
by Filippo Bianchi 31 Oct '23

31 Oct '23

Carə tuttə, Giovedì 2 Novembre alle 14.30 in Aula Seminari si terrà il seminario di Francesco Costantino (Université Toulouse III) dal titolo "Costruzione di TQFT di dimensione 3 e 4". Di seguito l'abstract. Comincerò questo seminario ricordando la definizione delle TQFT in dimensione n e alcuni fatti generali (e.g. la definizione degli invarianti « quantistici » associati). Utilizzando poi una presentazione di Juhasz della categoria dei cobordismi darò un’idea della costruzione recente di nuove famiglie di TQFT in dimensione 2+1 e 3+1, basata su categorie di un tipo molto generale e che in dimensione 3 include per esempio le costruzioni di Turaev-Viro o più in generale di Barrett e Westbury, ma nel caso di categorie non semi-semplici. Terminerò parlando della costruzione in dimensione 4 e degli invarianti associati indicando alcune delle ostruzioni attualmente note per ottenere invarianti che siano capaci di distinguere varietà omeomorfe ma non diffeomorfe. (In collaborazione con : N. Geer, B. Patureau, B. Haioun e A. Virelizier) Ci troveremo alle 13 in atrio per andare a pranzo con Francesco. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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MIni workshop in TDA in Turin
by Carlo Collari 27 Oct '23

27 Oct '23

Cari tutti, Trasmetto per conoscenza Cordialmente, Carlo > Dear applied topologists, > We are pleased to announce the forthcoming mini-workshop TDA in Turin <https://sites.google.com/view/tdainturin/home-page>, which will be held in >Turin on November 29th. > For more details, please visit our webpage or contact one of the organisers. > Kind regards, > the organisers

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Postdoc position in Geometry and Topology at the University of Pisa
by Bruno Martelli 20 Oct '23

20 Oct '23

Dear colleague, I would like to advertise a 2 years postdoc position in Geometry and Topology in Pisa, Italy, starting from the beginning of 2024. The position is supported by the PRIN Project "Geometry and topology of manifolds". You can find all the relevant information here: https://bandi.unipi.it/public/Bandi/Detail/44ed0733-57e0-4063-8c8f-1d1b7530… The deadline is November 20 at 1 pm (local time). Please forward this announcement to any potential candidate. If you have any questions, do not hesitate to contact me. Best regards, Bruno Martelli

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Seminario di geometria e topologia 19/10 e pretalk 18/10
by Filippo Bianchi 19 Oct '23

19 Oct '23

Carə tuttə, Giovedì 19 Ottobre alle 14.30 in Aula Seminari si terrà il seminario di Vera Vértesi (Universität Wien) dal titolo "The Giroux correspondence via convex surfaces". Di seguito l'abstract. The “hard direction” of the Giroux correspondence states that any two open books representing the same contact structure are related by a sequence of positive stabilisations and destabilisations. We give a proof of this statement for tight contact structures using convex surface theory. This is a joint work with Joan Licata. Mercoledì 18 Ottobre alle 16.30 in Aula Seminari terrò un pretalk su strutture di contatto e libri aperti, indirizzato particolarmente a studenti magistrali interessati al seminario. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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[Indico] George H. Seelinger, A raising operator formula for Macdonald polynomials, 12/10/2023, 14:30 Europe/Rome
by francesco.sala＠unipi.it 09 Oct '23

09 Oct '23

Title: A raising operator formula for Macdonald polynomials, Speaker(s): George H. Seelinger, University of Michigan, Date and time: 12 Oct 2023, 14:30 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Riunioni). You can access the full event here: https://events.dm.unipi.it/e/211 Abstract -------- Macdonald polynomials are a basis of symmetric functions with coefficients in $\mathbb{Q}(q,t)$ exhibiting deep connections to representation theory and algebraic geometry. In particular, specific specializations of the $q,t$ parameters recover various widely studied bases of symmetric functions, such as Hall-Littlewood polynomials, Jack polynomials, q-Whittaker functions, and Schur functions. Central to this study is the fact that the Schur function basis expansion of the Macdonald polynomials have coefficients which are polynomials in $q,t$ with nonnegative integer coefficients, which can be realized via a representation-theoretic model. A more combinatorial approach to this result lies in first expanding Macdonald polynomials into LLT polynomials via the work of Haglund-Haiman-Loehr. LLT polynomials were first introduced by Lascoux-Leclerc-Thibbon as a q-deformation of a product of Schur polynomials and have subsequently appeared in the study of Macdonald polynomials and related families. In this talk, I will explain this background and provide a new explicit "raising operator" formula for Macdonald polynomials that follows from a realization of LLT polynomials in the elliptic Hall algebra of Burban and Schiffmann, which we describe via an isomorphism between the shuffle algebra studied by Feigin and Tsymbaliuk and part of the elliptic Hall algebra. This work is joint with Jonah Blasiak, Mark Haiman, Jennifer Morse, and Anna Pun. -- Indico :: Email Notifier https://events.dm.unipi.it/e/211

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Seminario di geometria 28/09 e pretalk 27/09
by Filippo Bianchi 28 Sep '23

28 Sep '23

Carə tuttə, Giovedì 28 Settembre alle 14.30 in Aula Seminari si terrà il seminario di Ken Baker (University of Miami) dal titolo "Handle numbers of knots and sutured manifolds". Di seguito l'abstract. The handle number, or Morse-Novikov number, of a knot counts the minimum number of handles needed for a circular Heegaard splitting of its exterior. It may be viewed as a measure of distance from fiberedness. The rank of the top groups of the instanton and Heegaard knot Floer homologies also provide another measure. Here we show that the nearly fibered knots of the Floer sense due to Li-Ye and Baldwin-Sivek are not always nearly fibered in the handle number sense. In the process we also provide conditions for knots to have unique incompressible Seifert surfaces and show that some Floer nearly-fibered knots have incompressible Seifert surfaces of non-minimal genus. Mercoledì 27 Settembre alle 14.30 in Aula Riunioni, Ken terrà un pretalk sugli argomenti del seminario. Le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Filippo, Giovanni e Giuseppe

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Workshop "Combinatorial algebraic topology and applications" announcement
by Carlo Collari 21 Sep '23

21 Sep '23

Dear all, We are happy to announce the workshop CATA: *Combinatorial algebraic topology and applications. *CATA is a two-days event that will be held at Centro De Giorgi in Pisa the 27th and 28th, November 2023. The workshop concerns various topics in combinatorics and algebraic topology, as well as their applications to different fields, e.g. data analysis, neural sciences and economics. The aim of the workshop is to gather researchers with common interest in the above topics, and to create an atmosphere of discussion, where to share ideas. Leó Benard (Université de Aix-Marseille) Celeste Damiani (Istituto Italiano di Tecnologia) Irakli Patchkoria (University of Aberdeen) Simona Settepanella (Università di Torino) Jason P. Smith (Nottingham Trent University) Paolo Salvatore (Università di Roma Tor Vergata) Viola Siconolfi (Politecnico di Bari) Jonathan Spreer (University of Sydney/TU Berlin) Limited funding might be available to early registered participants. If needed, please contact Luigi Caputi (luigi.caputi(a)unito.it) or Carlo Collari (carlo.collari(a)dm.unipi.it). The workshop also includes a poster session. Those interested in presenting a poster should send an email to crm(a)sns.it, including title and abstract, for the evaluation by the Scientific Committee. For more information visit the website: http://www.crm.sns.it/event/523/ Looking forward to seeing you in Pisa. The organisers, Luigi Caputi, Carlo Collari, and Paolo Lisca

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I: assegni di ricerca a Tor Vergata
by Paolo Lisca 16 Sep '23

16 Sep '23

Inoltro annuncio di bando per assegni di ricerca. Paolo Lisca ________________________________ Da: Filippo Bracci <fbracci(a)mat.uniroma2.it> Inviato: sabato 16 settembre 2023 10:34 A: Filippo Bracci Oggetto: assegni di ricerca a Tor Vergata Carissime e carissimi, è stato pubblicato il bando per 4 assegni di ricerca biennali di III fascia (circa 25.000 euro annui al netto degli oneri) su ogni area della Matematica legata la progetto di eccellenza del Dipartimento di Matematica di Roma “Tor Vergata": https://pica.cineca.it/uniroma2/f3-2023-0008/ la scadenza per la presentazione delle domande è il 14 ottobre 2023. Vi prego di far circolare l’annuncio tra le persone potenzialmente interessate, grazie A presto Filippo -- ************************ Prof. Filippo Bracci Direttore/Head Dipartimento di Matematica Universita' di Roma "Tor Vergata" Via della Ricerca Scientifica 1 00133 Roma - ITALIA Tel: (+39-)06-7259 4643/4105 Fax: (+39-)06-7259 4699 E-mail: fbracci(a)mat.uniroma2.it Web-page: www.mat.uniroma2.it/~fbracci

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Fwd: [gdrtresses] WinterBraids XIII
by Bruno Martelli 02 Sep '23

02 Sep '23

---------- Forwarded message --------- Da: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Sab 2 Set 2023, 10:00 Subject: [gdrtresses] WinterBraids XIII To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> ***************************************************** Winterbraids XIII --- second announcement School on braids and low-dimensional topology Montpellier, February 6-9 2024 ****************************************************** Winterbraids XIII is the 13th edition of an itinerant school on braids and low-dimensional topology, that will be held at Institut Montpelliérain Alexander Grothendieck (Montpellier) from February 6th to 9th, 2024. The school consists on three 3-hours mini-courses and a special lecture: * Asilata Bapat (ANU, Australia): Braids and stability conditions * Marco Golla (Nantes, France): Surfaces in 4-manifolds * Bram Petri (Sorbonne, France): Probabilistic methods in low-dimensional hyperbolic geometry * Vincent Pilaud (Polytechnique, France): Combinatorial geometry These will be completed by short talks and a poster session devoted to student presentations (not necessarily focused on braids or their generalizations). The school will be mainly supported by the Institut Montpelliérain Alexander Grothendieck, the Université de Montpellier, the GDR Tresses, the ETH Zürich, and the European Commission. The school will start on Tuesday morning and will end on Friday at noon. Registrations are avaible online: (deadline 15 november) https://winterbraids-xiii.sciencesconf.org/ For any queries, please contact the organizers at winterbraids-xiii(a)sciencesconf.org Organizers: Berenice Delcroix-Oger (Université de Montpellier) Peter Feller (ETH, Zurich) Vincent Florens (Université de Pau et des pays de l'Adour) Hoel Queffelec (Université de Montpellier)

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Convegno UMI - Sezione S17 – Topologia e Geometria differenziale
by Bruno Martelli 22 Aug '23

22 Aug '23

Buondì, Segnalo che nei primi due giorni del convegno UMI a Pisa - lunedì 4 e martedì 5 settembre - si svolgerà la sezione "Topologia e Geometria differenziale" che ho coordinato con Barbara Nelli. Questo è il programma: https://umi.dm.unibo.it/congresso2023/programma/sezioni/s16-topologia-e-geo… I seminari saranno in aula G1. Programma sintetico: Lunedì 4 settembre 15 Aceto 15.40 Moraschini Martedì 5 settembre 11 Fanoni 11.40 Cavallucci 12.20 Tamburelli 16.45 Santilli 17.25 Slavich A presto, Bruno Martelli

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Assegno di ricerca in geometria
by Bruno Martelli 18 Aug '23

18 Aug '23

Buondì, Segnalo che è aperto un bando per un assegno di ricerca biennale (rinnovabile) in geometria presso il nostro dipartimento: https://bandi.unipi.it/public/Bandi/Detail/eddcd650-ec55-459a-9511-5a6e0762… La scadenza per la presentazione delle domande è il 6 settembre alle 13. Si prega di dare la massima diffusione. A presto, Bruno Martelli

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Fwd: Seventh postdoc in Paolo's memory
by Bruno Martelli 30 Jul '23

30 Jul '23

---------- Forwarded message --------- From: Daniele Angella <daniele.angella(a)unifi.it> Date: Wed, Jul 26, 2023 at 12:35 PM Subject: Fwd: Seventh postdoc in Paolo's memory To: geometriaglobale-group(a)unifi.it <geometriaglobale-group(a)unifi.it> ---------- Forwarded message --------- From: Fiammetta Battaglia <fiammetta.battaglia(a)unifi.it> Date: Wed, Jul 26, 2023 at 12:19 PM Subject: Seventh postdoc in Paolo's memory Dear all, The official call for the seventh postdoc position in Paolo's memory has been published. As for the previous editions, we invite you to publicise the announcement. You may find a letter below with all the details. This year Elisa Prato, professor in Geometry at our Department, will be in charge of the post-doc position. Best wishes to you all, Fiammetta ----------------------------------------------------------------------------------------------------------------------------------------------------------- Postdoctoral position in memory of Paolo de Bartolomeis Deadline: 18 Ottobre 2023 A postdoctoral position has been established at the Dipartimento di Matematica e Informatica "U. Dini", Università di Firenze, Italy. Strong candidates pursuing research in Complex and Symplectic Geometry, in the broadest sense, are warmly encouraged to apply within October, 18, 2023. The duration of this position is one year, possibly extendable for one further year. Details for the application can be found at the following link: https://titulus.unifi.it/albo/viewer?view=files%2F005071398-UNFICLE-1f7fcfe… Note that the English version of the forms that have to be submitted in order to apply can be found at the end of the official call. Forms may be filled in English. The application must be sent with all the required forms attached, in a unique email, as indicated. This position has been established in memory of Professor Paolo de Bartolomeis and is fully funded by his family, with the aim of giving the opportunity to a young researcher to carry out research in the above fields. Please circulate this announcement to potential candidates. For further information please contact: fiammetta.battaglia(a)unifi.it, antonella.nannicini(a)unifi.it or elisa.prato(a)unifi.it

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Fwd: September conference in Heidelberg
by Bruno Martelli 14 Jul '23

14 Jul '23

---------- Forwarded message --------- Da: Max Riestenberg <mriestenberg(a)mathi.uni-heidelberg.de> Date: Gio 13 Lug 2023, 17:24 Subject: September conference in Heidelberg To: Cc: Heller, Julia (IAG) <julia.heller(a)kit.edu>, Levin Maier < lmaier(a)mathi.uni-heidelberg.de> Dear all, We are organizing a conference for early career researchers in groups, geometry and dynamics in Heidelberg this September. I was wondering if you could circulate the announcement to grad students and postdocs? The deadline to register is July 24. Thanks! Max Riestenberg Information below: -------------------------- We are pleased to announce that the registration <https://www.groups-and-spaces.kit.edu/740.php> for the RTG conference "Diverse aspects of groups, geometry and dynamics <https://www.groups-and-spaces.kit.edu/732.php>" is now open. The conference will take place *September 18-20, 2023 in Heidelberg* at the Mathematikon. The conference will consist of three minicourses and several research talks. The tentative list of speakers is below: Minicourses Viveka Erlandsson, University of Bristol, UK Anne Parreau, Institut Fourier, Université Grenoble Alpes, France Yulan Qing, Shanghai Center for Mathematical Sciences, Fudan University, China Research Talks Johanna Bimmermann, Ruhr-Universität Bochum, Germany María Cumplido Cabello, Universidad de Sevilla, Spain Arielle Leitner, Weizmann Institute of Science and Afeka College of Engineering, Israel Rylee Lyman, Rutgers University–Newark, USA Marta Magnani, Ruprecht-Karls-Universität Heidelberg, Germany Sara Maloni, University of Virginia, USA Silvia Sabatini, Universität zu Köln, Germany Sheila Sandon, IRMA, Université de Strasbourg, France Neza Zager Korenjak, University of Texas at Austin, USA We may have limited funding for young participants. The deadline for registration is *July 24*. Best regards, Max Riestenberg Julia Heller Levin Maier

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Fwd: [gdrtresses] Research Fellow in Representation Theory and/or Low Dimensional Topology (one or two positions available) at Leeds.
by Bruno Martelli 06 Jul '23

06 Jul '23

---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Mon, Jul 3, 2023 at 3:43 PM Subject: [gdrtresses] Research Fellow in Representation Theory and/or Low Dimensional Topology (one or two positions available) at Leeds. To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> Research Fellow in Representation Theory and/or Low Dimensional Topology (one or two positions available) at Leeds. We are looking for one or two Postdoctoral Research Fellows to work on the EPSRC Programme Grant: "Combinatorial Representation Theory: Discovering the Interfaces of Algebra with Geometry and Topology". Apply here https://jobs.leeds.ac.uk/Vacancy.aspx?ref=EPSMA1084 The project is led by the 6 Investigators: Professor Karin Baur, principal investigator, together with co-investigators Professor Eleonore Faber, Dr Joao Faria Martins, Professor Bethany Marsh, Professor Paul Martin and Dr Alison Parker. The vision of the Programme Grant is to develop a broad and holistic theory of representation theory, engaging and unifying diverse perspectives, from algebra, geometry and topology to physics, life sciences and engineering, enabling a cross-discipline transfer of ideas. Our aim is thus to develop a unifying representation theory, which acts as a conduit for cross- fertilization between these disciplines. The Programme grant is organised around the Themes, T1 – T4, below: T1. Algebras bridging between combinatorics and geometry; T2. Mutation of algebraic and geometric structures; T3. Algebraic geometry of Grassmannians and moduli spaces; T4. Computations for Physics. For list of Work Packages, including how they are organised into Themes, we refer to our Research Webpage. An ability to work on Theme 1 and / or Theme 4 is preferred for this call. In particular, preference will be given to candidates with expertise in one or more of the following areas: diagram algebras, Hecke algebras, Brauer algebras, homological algebra, algebraic groups, (extended) topological quantum field theory, topological quantum computing, and geometric topology. An ability to work across different work packages, and moreover facility in establishing connections between different themes is a strong plus. The Programme grant is flexible and applications from candidates with the potential to work on any of the themes or work packages will be considered. The Programme Grant team is committed to Equality, Diversity, and Inclusion, and to an environment free of any type of discrimination, and where everyone can reach their full potential. As a group, we will strive to support the career development of the postdoctoral research fellows that we recruit, and to provide them with the optimal environment, including the flexibility, to support their development as the future generation of world-leading researchers. The School of Mathematics also offers a number of family-friendly employment practices that are designed to enable a good work-life balance and to be responsive to support personal circumstances. In many roles we offer flexible working and part-time working, and we have a range of services to help support staff through work and personal challenges. What we offer in return 26 days holiday plus approx.16 Bank Holidays/days that the University is closed by custom (including Christmas) – That's 42 days a year! Generous pension scheme plus life assurance – the University contributes 21.6% of salary. Health and Wellbeing: Discounted staff membership options at The Edge, our state-of-the-art Campus gym, with a pool, sauna, climbing wall, cycle circuit, and sports halls. Personal Development: Access to courses run by our Organisational Development & Professional Learning team, and self-development courses including languages, Creative Writing, Wellbeing Therapies and much more. Access to on-site childcare, shopping discounts and travel schemes are also available. And much more! To explore the post further or for any queries you may have, please contact: Karin Baur, Professor (Principal Investigator) Email: K.U.Baur(a)leeds.ac.uk OR João Faria Martins, Associate Professor (Co-investigator) Email: J.FariaMartins(a)leeds.ac.uk OR Paul Martin, Professor, (Co-investigator) Email: P.P.Martin(a)leeds.ac.uk Apply here https://jobs.leeds.ac.uk/Vacancy.aspx?ref=EPSMA1084

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Seminario di geometria giovedì (luogo e ora diversi)
by Filippo Bianchi 20 Jun '23

20 Jun '23

Carə tuttə, Vi ricordo che giovedì 22 Giugno si terrà il seminario di Francesco Lin (Columbia University) dal titolo "Homology cobordism and the geometry of hyperbolic three-manifolds". Eccezionalmente, il seminario sarà alle 14.30 in Aula Riunioni. Di seguito l'abstract. A major challenge in the study of the structure of the three-dimensional homology cobordism group is to understand the interaction between hyperbolic geometry and homology cobordism. In this talk, I will discuss how monopole Floer homology can be used to study some basic properties of certain subgroups of the homology cobordism group generated by hyperbolic homology spheres satisfying some natural geometric constraints. Questo seminario sarà l'ultimo del semestre. Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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[Indico] Davide Moroni, Persistent homology in action: bridging topology and machine learning, 20/06/2023, 15:00 Europe/Rome
by francesco.sala＠unipi.it 16 Jun '23

16 Jun '23

Title: Persistent homology in action: bridging topology and machine learning, Speaker(s): Davide Moroni, CNR, Pisa, Date and time: 20 Jun 2023, 15:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (N1). You can access the full event here: https://events.dm.unipi.it/e/196 Abstract -------- Based on recent advances in representations based on topological descriptors, the talk will discuss how to leverage persistent homology for dealing with classification tasks of digital data. Applications to biomedical signal processing will be given (joint work with CNR-IBF and the Department of Surgical, Medical, Molecular Pathology and Critical Area, University of Pisa). -- Indico :: Email Notifier https://events.dm.unipi.it/e/196

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Seminario di geometria oggi
by Filippo Bianchi 15 Jun '23

15 Jun '23

Carə tuttə, Scusandomi per il poco preavviso, vi ricordo che oggi 15 Giugno in Aula Seminari alle 11 si terrà il seminario di Marco Moraschini (Università di Bologna) dal titolo "Acyclicity in bounded cohomology". Di seguito l'abstract. Bounded cohomology is an invariant of groups introduced by Johnson in the 70s and then extensively studied both in geometric group theory and in low dimensional topology after the pioneering paper by Gromov (1982). Bounded cohomology is known to vanish in presence of amenable groups, but it is hard to compute for most groups (e.g. we do not know the full bounded cohomology of the non-abelian free group with two generators). In this talk we will introduce bounded cohomology and discuss some recent computations involving boundedly acyclic groups (i.e. groups with trivial bounded cohomology in all positive degrees). We will report some results in collaboration with Francesco Fournier-Facio, Clara Löh and George Raptis. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Il seminario successivo sarà Giovedì 22 Giugno in Aula Seminari alle 11: avremo Francesco Lin (Columbia University), che ci parlerà di "Homology cobordism and the geometry of hyperbolic three-manifolds". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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postdoctoral fellowship in Bologna
by Martino Lupini 08 Jun '23

08 Jun '23

Dear all, Another post-doctoral fellowship (assegno di ricerca) at the University of Bologna on interactions between topology, homological algebra, and logic has just been advertised. (This is different from the one that was advertised in April!) https://bandi.unibo.it/ricerca/assegni-ricerca?id_bando=66430 This position is co-funded by the Department of Mathematics and the ERC project "Definable Algebraic Topology". The duration of the position is 1 year, with the possibility of being extended up to 3 years. The application deadline is June 23, 2023. Please feel free to forward this information to anyone who might be interested. I will be happy to answer any questions about this opportunity. Best, Martino

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Niente seminario di geometria domani
by Filippo Bianchi 07 Jun '23

07 Jun '23

Carə tuttə, Il seminario annunciato per domani 8 Giugno NON si terrà. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Il seminario successivo sarà Giovedì 15 Giugno in Aula Seminari alle 11: avremo Marco Moraschini (Università di Bologna), che ci parlerà di "Acyclicity in bounded cohomology". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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Fwd: [gdrtresses] Rencontres du GDR à Marseille du 28 aout au 1er septembre (deuxième annonce)
by Bruno Martelli 06 Jun '23

06 Jun '23

---------- Forwarded message --------- Da: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Mar 6 Giu 2023, 14:47 Subject: [gdrtresses] Rencontres du GDR à Marseille du 28 aout au 1er septembre (deuxième annonce) To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> (English version below) Chères et chers et collègues, Nous avons le plaisir de vous annoncer que les journées 2023 du GDR Tresses se tiendront à Marseille du lundi 28 août au vendredi 1er septembre 2023. En plus d'une dizaine d'exposés courts d'une demi-heure proposés par les participants, les journées comporteront deux mini-cours sur la thématique des surfaces en dimension 4: - Plongements de surfaces en dimension quatre, par Mark Powell (University of Glasgow); - Une approche combinatoire des surfaces nouées en dimension 4, par Jean- Baptiste Meilhan (Université de Grenoble Alpes); ainsi que cinq exposés pléniers sur les thèmes du GDR: - Noémie Legout (Uppsala Universitet); - Mélanie Theillière (Université du Luxembourg); - Filippo Calegaro (Universita di Pisa); - Bruno Martelli (Universita di Pisa); - Marco de Renzi (University of Zurich). Proche du centre-ville, et donnant sur la mer, tous les exposés auront lieu dans la station marine d'Endoume. Une aide financière est possible pour le logement des jeunes participants. Les inscriptions sont ouvertes jusqu'au 1er juillet 2023 à l'adresse suivante: https://tresses2023.sciencesconf.org/. N'hésitez pas à relayer l'information autour de vous, notamment dans vos laboratoires. Le comité d'organisation, Delphine Moussard Benjamin Audoux Emmanuel Wagner --------------------------------------------------------------------------------------------------------------- Dear colleagues, We are pleased to announce that the GDR Tresse will organize an international conference on Surfaces and manifolds in dimension 4 and, more generally, on the topics of the GDR. This conference will take place in Marseille from Monday 28th of August to Friday 1st of September. Besides a dozen short talks (1/2h), the conference will yield two mini- courses: - Embeddings of surfaces in dimension 4, by Mark Powell (University of Glasgow); - A combinatorial approach to knotted surfaces in 4-space, by Jean-Baptiste Meilhan (Université de Grenoble Alpes); as well as five plenary talks (1h) on the other thematics of the GDR: - Noémie Legout (Uppsala Universitet); - Mélanie Theillière (Université du Luxembourg); - Filippo Calegaro (Universita di Pisa); - Bruno Martelli (Universita di Pisa); - Marco de Renzi (University of Zurich). Near from downtown and overlooking the sea, all the talks will take place at the Marine Station of Endoume. Some financial support for the lodging of younger participants is available. Registration is open until July 1st 2023 at the following address: https://tresses2023.sciencesconf.org/. Please, do relay the information around you, and especially in your laboratories. The organizing committee Delphine Moussard Benjamin Audoux Emmanuel Wagner

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Convegno UMI - Sezione topologia e geometria differenziale
by Bruno Martelli 06 Jun '23

06 Jun '23

Buondì, Nell'ambito del Convegno UMI a Pisa del 4-9 settembre, la sezione di topologia e geometria differenziale sarà attiva nei giorni lunedì 4 (pomeriggio) e martedì 5 (mattina e pomeriggio), con i seguenti speaker: Paolo Aceto Nicola Cavallucci Federica Fanoni Marco Moraschini Mario Santili Leone Slavich Andrea Tamburelli A presto, Bruno Martelli

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Fwd: [gdrtresses] Post-doctoral Position Dijon
by Bruno Martelli 02 Jun '23

02 Jun '23

---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Fri, Jun 2, 2023 at 5:22 PM Subject: [gdrtresses] Post-doctoral Position Dijon To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> A one-year post-doctoral position at the Institute of Mathematics of Burgundy will be funded by the ANR for the ANR-T-ERC project "New Applications of Quantum Invariants to 3- and 4-dimensional Topology". Applications displaying expertise in one or more of the following fields will be particularly appreciated: Quantum invariants, mapping class groups of surfaces, homology of configuration spaces, concordance, trisections, skein modules. The deadline for applications will be June 30th 2024 and the contract can start between October 1st 2023 and January 1st 2024. Applicants must send a CV with a list of publications, a short summary of previous research and projects, and a cover letter to renaud.detcherry(a)u-bourgogne.fr For more information on the position, please visit the webpage: https://math.u-bourgogne.fr/wp-content/uploads/2023/06/PostdocOffer.pdf

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Seminario di Geometria 1 Giugno Aula Magna
by Filippo Bianchi 31 May '23

31 May '23

Carə tuttə, Vi ricordo che domani 1 Giugno in Aula Magna si terrà il seminario di Andrew Lobb (Durham University) dal titolo "Four-sided pegs fitting round holes fit all smooth holes". Di seguito l'abstract. Given a smooth Jordan curve and a cyclic quadrilateral (a cyclic quadrilateral is a quadrilateral that can be inscribed in a circle) we show that there exist four points on the Jordan curve forming the vertices of a quadrilateral similar to the one given. No prior knowledge of anything assumed. Joint work with Josh Greene. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito. Il seminario successivo sarà Giovedì 8 Giugno in Aula Seminari alle 11: avremo Arunima Ray (MPIM Bonn), e il titolo del talk sarà "Topologically slice knots in simply connected 4-manifolds". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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[Indico] Bruno Benedetti, Vertex labeling properties on simplicial complexes, 31/05/2023, 15:00 Europe/Rome
by francesco.sala＠unipi.it 29 May '23

29 May '23

Title: Vertex labeling properties on simplicial complexes, Speaker(s): Bruno Benedetti, University of Miami, Date and time: 31 May 2023, 15:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/194 Abstract -------- Hamiltonian graphs are graphs where one can find a closed walk that touches all vertices exactly once. Equivalently, they are the graphs whose vertices can be labeled from 1 to n so that all of 12, 23, 34, …, n1 feature among the edges. This second definition has the advantage that it can be extended to simplicial complexes of dimension higher than one. Similarly, one can extend to complexes many other famous properties of graph theory (like chordality or being interval) which can be characterized via vertex labelings. We extend to all dimensions the famous result that all unit-interval 2-connected graphs are Hamiltonian. If time permits, we also discuss how to characterize unit-interval graphs and complexes in algebraic terms (i.e. in terms of Groebner bases of determinantal ideals). This is joint work with Matteo Varbaro and Lisa Seccia. -- Indico :: Email Notifier https://events.dm.unipi.it/e/194

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Seminario di geometria domani
by Filippo Bianchi 24 May '23

24 May '23

Carə tuttə, Vi ricordo che domani 18 Maggio in Aula Seminari si terrà il seminario di Diego Santoro (SNS Pisa) dal titolo "L-spaces, taut foliations and fibered hyperbolic two-bridge links". Di seguito l'abstract. Heegaard Floer homology was defined by Ozsváth and Szabó in the early 2000s. It consists of a package of invariants of closed oriented 3-manifolds and it has found many important and profound applications in low dimensional topology. I will introduce the L-space conjecture, that boldly predicts strong connections among properties relating Heegaard Floer homology, foliations and the fundamental group of an irreducible rational homology 3-sphere. I will then state a result concerning this conjecture for manifolds that arise as surgeries on fibered hyperbolic two-bridge links. We will also see how to apply this result to deduce that all non-meridional surgeries on Whitehead doubles of a non-trivial knot support coorientable taut foliations. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Il seminario successivo sarà Giovedì 01 Giugno in Aula Seminari alle 11: avremo Andrew Lobb (Durham University), e il titolo del talk sarà "Four-sided pegs fitting round holes fit all smooth holes". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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PhD positions in Bologna
by Martino Lupini 24 May '23

24 May '23

Dear all, A call for applications for 12 PhD positions at the University of Bologna has just been announced, with deadline June 20, 2023. Italian version: https://www.unibo.it/it/didattica/dottorati/2023-2024/matematica English version: https://www.unibo.it/en/teaching/phd/2023-2024/mathematics One of these positions is funded by the ERC project "Definable algebraic topology" and is reserved for candidates who plan to work on this project, which focuses on interactions between logic, algebraic topology, and homological algebra. Please feel free to forward this announcement to anyone who might be interested. I will be happy to answer any question anyone might have on this opportunity. Best, Martino

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Fwd: [Personale.docente.dm] "Per una storia della teoria dei gruppi di Lie: dalle origini a Cartan", lezione di Alberto Cogliati martedì 30 maggio ore 11, Aula Magna
by Bruno Martelli 23 May '23

23 May '23

---------- Forwarded message --------- Da: Giovanni Gaiffi <giovanni.gaiffi(a)unipi.it> Date: Mar 23 Mag 2023, 12:45 Subject: [Personale.docente.dm] "Per una storia della teoria dei gruppi di Lie: dalle origini a Cartan", lezione di Alberto Cogliati martedì 30 maggio ore 11, Aula Magna To: personale.docente(a)dm.unipi.it <personale.docente(a)dm.unipi.it>, dottorandi(a)lists.dm.unipi.it <dottorandi(a)lists.dm.unipi.it> Cari colleghi, vi segnalo che martedì 30 maggio alle ore 11, in Aula Magna, Alberto Cogliati terrà una lezione dal titolo “Per una storia della teoria dei gruppi di Lie: dalle origini a Cartan” (vedi abstract qui sotto).La lezione costituisce una conclusione speciale del corso “Algebre e gruppi di Lie”; ve la segnalo perché penso che possa interessare anche ad un pubblico più vasto. Molti saluti, Giovanni Per una storia della teoria dei gruppi di Lie: dalle origini a Cartan – Alberto Cogliati (Università di Pisa) Venue Dipartimento di Matematica, Aula Magna Abstract L’odierna teoria dei gruppi e delle algebre di Lie ha la propria origine in una serie di ricerche che il matematico Sophus Lie avvia sin dai primi anni Settanta dell’Ottocento con l’obiettivo di costruire una estensione della teoria di Galois per l’integrazione di particolari classi di equazioni differenziali (ordinarie e non). Nell’arco di un decennio la “teoria dei gruppi finiti e continui” (per usare la denominazione impiegata dallo stesso Lie) conosce un’ampia diffusione, trovando applicazione in svariati ambiti della matematica, quali: la teoria delle equazioni differenziali, i fondamenti della geometria e la teoria degli invarianti. In questo contesto di generale interesse, solo qualche anno più tardi, si inseriscono i lavori di Wilhelm Killing (1888-1890) e di Élie Cartan (1894) nei quali sono poste le basi per la teoria della struttura e della classificazione delle algebre di Lie (complesse) semplici. Il contenuto della lezione si articolerà intorno ad alcuni quesiti (ai quali tenterò di dare, almeno spero, qualche risposta): quali motivazioni spinsero Lie e altri matematici ad occuparsi dei “gruppi di Lie”? Che cosa è per Lie un “gruppo di Lie”? E un’algebra di Lie? Come si realizzò, a grandi linee, la classificazione delle algebre di Lie (complesse) semplici? Le sottoalgebre di Cartan sono davvero di Cartan? E la forma di Killing è davvero di Killing?

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Fwd: [Personale.docente.dm] Assegni di ricerca
by Bruno Martelli 23 May '23

23 May '23

Segnalo due assegni di ricerca biennali in matematica banditi dal nostro dipartimento. Non è necessario avere già il titolo di dottorato per partecipare. Bruno ---------- Forwarded message --------- From: Direttore Matematica Pisa <direttore(a)dm.unipi.it> Date: Tue, May 23, 2023 at 3:55 AM Subject: [Personale.docente.dm] Assegni di ricerca To: personale.docente(a)dm.unipi.it <personale.docente(a)dm.unipi.it> Cc: Simona Guidotti <simona.guidotti(a)unipi.it>, Cristina Lossi < cristina.lossi(a)unipi.it> Buongiorno, segnalo l'uscita dei due assegni di ricerca biennali a tema generale di Matematica, con scadenza 19 giugno alle ore 13. I bandi sono consultabili ai seguenti link: https://bandi.unipi.it/public/Bandi/Detail/8b0389fe-808f-4152-8a44-02380d65… https://bandi.unipi.it/public/Bandi/Detail/dfe05072-6753-434a-8551-65f50969… Chiedo e tutti/e di dare la più ampia pubblicità a queste posizioni. Grazie e buona giornata, Matteo

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[Indico] Maria Antonietta Pascali, Introduction to persistent homology, 23/05/2023, 14:30 Europe/Rome
by francesco.sala＠unipi.it 19 May '23

19 May '23

Title: Introduction to persistent homology, Speaker(s): Maria Antonietta Pascali, CNR, Pisa, Date and time: 23 May 2023, 14:30 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/195 Abstract -------- The talk will trace the history of persistent homology from its definition to the recent developments, describing the most important properties and theorems of persistent diagrams, with an eye to their applications. -- Indico :: Email Notifier https://events.dm.unipi.it/e/195

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Seminario di geometria domani
by Filippo Bianchi 17 May '23

17 May '23

Carə tuttə, Vi ricordo che domani 18 Maggio in Aula Seminari si terrà il seminario di Gabriele Viaggi (University of Heidelberg) dal titolo "Divisible convex sets with properly embedded cones". Di seguito l'abstract. An open subset of real projective space is said to be properly convex if it is contained in an affine chart where it is convex and bounded. Together with their natural Hilbert metric and group of projective symmetries, properly convex sets are a rich source of geometry, dynamics, and group theory. Of particular interest are those that are divisible, that is, they admit a compact quotient by a discrete group of symmetries. In general, it is a challenging problem to construct such examples. After reviewing the global classification scheme, I will describe a new class of examples of divisible convex sets with special geometric properties (non-symmetric and non-strictly convex) that completes a missing part of the picture. This is joint work with Pierre-Louis Blayac. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Il seminario successivo sarà Giovedì 25 Maggio in Aula Seminari alle 11: avremo Diego Santoro (SNS Pisa) che ci parlerà di "L-spaces, taut foliations and fibered hyperbolic two-bridge links". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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Seminario di geometria oggi
by Filippo Bianchi 11 May '23

11 May '23

Carə tuttə, Scusandomi per il poco preavviso, vi ricordo che oggi 11 Maggio in Aula Seminari avremo due seminari di geometria: alle 10 si terrà il seminario di Alejandro Gil-García (Universität Hamburg) dal titolo "A class of locally inhomogeneous complete quaternionic Kähler manifolds". Di seguito l'abstract. We prove that the one-loop deformation of any quaternionic Kähler manifold in the class of c-map spaces is locally inhomogeneous. As a corollary, we obtain that the full isometry group of the one-loop deformation of any homogeneous c-map space has precisely cohomogeneity one. This is a joint work with Vicente Cortés and Arpan Saha (https://arxiv.org/abs/2210.10097). Alle 11.30 si terrà il seminario di R. Inanç Baykur (University of Massachusetts Amherst) dal titolo "Exotic 4-manifolds with signature zero". Di seguito l'abstract. We are going to talk about our recent construction of small symplectic 4-manifolds with signature zero, which include the smallest closed simply-connected exotic 4-manifolds with signature zero known to date. Our novel examples are derived from explicit Lefschetz fibrations, with spin and non-spin monodromies. Joint work with N. Hamada. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Il seminario successivo sarà Giovedì 18 Maggio in Aula Seminari alle 11: avremo Gabriele Viaggi (University of Heidelberg) che ci parlerà di "Divisible convex sets with properly embedded cones". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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Fwd: Talk on Thursday 11/05
by Filippo Bianchi 05 May '23

05 May '23

Segnalo un talk su gruppi di Coxeter e teoria dei modelli, giovedì prossimo. A presto, Filippo ________________________________ Da: Rosario Mennuni <R.Mennuni(a)posteo.net> Inviato: venerdì, maggio 5, 2023 4:58 PM A: Filippo Bianchi <filippo.bianchi(a)phd.unipi.it> Oggetto: Fwd: Talk on Thursday 11/05 Ciao Filippo, Giovedì prossimo nel seminario di logica ci sarà un talk sui gruppi di Coxeter. Potresti inoltrare l'annuncio ad eventuali interessati per favore? A presto, Rosario -------- Forwarded Message -------- Subject: Talk on Thursday 11/05 Date: Thu, 4 May 2023 13:21:04 +0200 From: Rosario Mennuni <rosario.mennuni(a)dm.unipi.it><mailto:rosario.mennuni@dm.unipi.it> To: slap(a)lists.dm.unipi.it<mailto:slap@lists.dm.unipi.it> Hi everyone, Our Logic Seminar will resume next Thursday, 11/05, with Gianluca Paolini (Università di Torino). More details at https://www.dm.unipi.it/eventi/the-isomorphism-problem-for-oligomorphic-gro… or below, as usual. The next and final talk of this semester will be given by Sonia L'Innocente on 01/06. Best wishes, Rosario ---------------------------------------------- Speaker: Gianluca Paolini Date and time: Thu 11/05, 14:30 Venue: Aula Seminari, Dipartimento di Matematica Title: First-order aspects of Coxeter groups Abstract: We will talk about recent advancement on the model theory of Coxeter groups. We will focus in particular on affine Coxeter groups and on Droms right-angled Coxeter groups. These investigations lead to a general model-theoretic analysis of homogeneity and existence of prime models in semidirect products of free abelian groups of finite rank by a finite group. This is joint with R. Sklinos.

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Seminario di geometria domani
by Filippo Bianchi 03 May '23

03 May '23

Carə tuttə, Vi ricordo che domani 4 Maggio alle 11 in Aula Seminari si terrà il seminario di Claudio Llosa Isenrich (Karlsruhe Institute of Technology) dal titolo "Finiteness properties, subgroups of hyperbolic groups and complex hyperbolic lattices". Di seguito l'abstract. Hyperbolic groups form an important class of finitely generated groups that has attracted much attention in Geometric Group Theory. We call a group of finiteness type $F_n$ if it has a classifying space with finitely man cells of dimension at most $n$, generalising finite presentability, which is equivalent to type $F_2$. Hyperbolic groups are of type $F_n$ for all $n$ and it is natural to ask if their subgroups inherit these strong finiteness properties. We use methods from complex geometry to show that every uniform arithmetic lattice with positive first Betti number in $PU(n,1)$ admits a finite index subgroup, which maps onto the integers with kernel of type $F_{n−1}$ and not $F_n$. This answers an old question of Brady and produces many finitely presented non-hyperbolic subgroups of hyperbolic groups. This is joint work with Pierre Py. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. La settimana prossima avremo due seminari, entrambi Giovedì 11 Maggio in Aula Seminari: alle 10 avremo Alejandro Gil-García (Universität Hamburg) che ci parlerà di "A class of locally inhomogeneous complete quaternionic Kähler manifolds", mentre alle 11.30 avremo R. Inanç Baykur (University of Massachusetts Amherst) che ci parlerà di "Exotic 4-manifolds with signature zero". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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Seminario di geometria domani
by Filippo Bianchi 26 Apr '23

26 Apr '23

Carə tuttə, Vi ricordo che domani 27 Aprile alle 11 in Aula Seminari si terrà il seminario di Federica Bertolotti (SNS Pisa) dal titolo "Integral Simplicial Volume and Delta Complexity: find the differences". Di seguito l'abstract. Integral Simplicial Volume and Delta Complexity are invariants that try to capture the complexity of manifolds in terms of simplices from two different points of view. The exact value of these two invariants is known in dimensions 1 and 2, where they always coincide. It is then a natural question whether these two invariants are still close to each other in higher dimensions. During this talk, we will see possible approaches to address this problem, even with the awareness that computations become very hard already in dimension 3. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Il seminario successivo sarà Giovedì 4 Maggio alle 11 in Aula Seminari: avremo Claudio Llosa Isenrich (Karlsruhe Institute of Technology) che ci parlerà di "Finiteness properties, subgroups of hyperbolic groups and complex hyperbolic lattices". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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Seminario di geometria 20/04
by Filippo Bianchi 20 Apr '23

20 Apr '23

Carə tuttə, Vi ricordo che oggi alle 11 in Aula Seminari si terrà il seminario di Léo Bénard (Georg-August Universität Göttingen) dal titolo "Torsion function on character variety, divisor and multiplicity". Di seguito l'abstract. Reidemeister torsion is a combinatorial invariant, famous among other things for distinguishing finite quotients of the sphere S^3, the lenticular spaces, which have the same homotopy type but which are not homeomorphic. The study of the torsion for more general 3-manifold (such as knot exteriors) is closely related to the study of their character varieties: these are algebraic varieties whose points are conjugacy classes of representations of fundamental groups. I will review some results I obtained in my thesis on this subject, and will discuss a recent result in collaboration with Ryoto Tange, Anh Tran and Jun Ueki, where we study the divisor induced by the torsion on these varieties. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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postdoc position in Bologna (deadline May 8)
by Martino Lupini 17 Apr '23

17 Apr '23

Hi, all, A 3-year postdoc position at the University in Bologna on connections between topology and logic has been announced https://bandi.unibo.it/ricerca/assegni-ricerca?id_bando=66281 The application deadline is May 8 Please feel free to forward to anyone who might be interested. I am happy to answer any question that any potential applicant might have. Best, Martino

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Seminari di Geometria 13/4
by Filippo Bianchi 13 Apr '23

13 Apr '23

Care tutte e cari tutti, Vi ricordo che domani alle 11 in Aula Seminari si terrà il seminario di Raphael Zentner (Durham University) dal titolo "SL(2,C)-character varieties of knots and maps of degree 1 – Raphael Zentner (Durham University)", di cui riporto l'abstract We ask to what extend the SL(2,C)-character variety of the fundamental group of the complement of a knot in S^3 determines the knot. Our methods use results from group theory, classical 3-manifold topology, but also geometric input in two ways: the geometrisation theorem for 3-manifolds, and instanton gauge theory. In particular this is connected to SU(2)-character varieties of two-component links, a topic where much less is known than in the case of knots. This is joint work with Michel Boileau, Teruaki Kitano, and Steven Sivek. Vi aspettiamo! Buona serata, Alice, Filippo e Giuseppe

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Seminario di geometria oggi
by Filippo Bianchi 06 Apr '23

06 Apr '23

Buonasera, Scusandoci per il poco preavviso, annunciamo il seminario di geometria di oggi. Ricordiamo che l'elenco completo dei seminari si trova a questa pagina<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. A presto, Filippo, Alice e Giuseppe ----- 06-Apr-2023 - 11:00 Sala Seminari (Dip. Matematica) Instanton Floer homology of almost-rational plumbings Antonio Alfieri UQAM Plumbed three-manifolds are those three-manifolds that can be be realized as links of isolated complex surface singularities. Inspired by Heegaard Floer theory Nemethi introduced a combinatorial invariant of complex surface singularities (lattice cohomology) that was recently proved to be is isomorphic to Heegaard Floer homology. I will give an introduction to lattice cohomology, and expose some work in collaboration with John Baldwin, Irving Dai, and Steven Sivek showing that the lattice cohomology of an almost-rational singularity is isomorphic to the framed Instanton Floer homology of its link.

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Fwd: Conference "Geometric Topology, Art, and Science" in Modena and Reggio Emilia (June 8-10, 2023)
by Bruno Martelli 06 Apr '23

06 Apr '23

---------- Forwarded message --------- Da: Maria Rita CASALI <mariarita.casali(a)unimore.it> Date: Mer 5 Apr 2023, 19:08 Subject: Conference "Geometric Topology, Art, and Science" in Modena and Reggio Emilia (June 8-10, 2023) To: Maria Rita CASALI <casali(a)unimore.it> Dear Colleagues, we are pleased to announce the conference *Geometric Topology, Art, and Science* to be held in Reggio Emilia (Italy) on June 9-10, 2023, with a pre-meeting in Modena on June 8, 2023. The conference is jointly organised by the Department of Physics, Informatics and Mathematics (FIM) and the Department of Sciences and Methods for Engineering (DISMI) of the University of Modena and Reggio Emilia, on the occasion of 70th birthday of Luigi Grasselli, full professor of Geometry at DISMI. The conference focuses on recent advances in Geometric Topology, with a particular attention to combinatorial descriptions of 3- and 4-manifolds (branched coverings, knots and braids, trisections, colored graphs, etc…), as well as to the interactions with other disciplines, ranging from physics (with the theory of *random tensors*) to geometrical aspects in classical and contemporary art. Confirmed speakers include • Bruno Benedetti (University of Miami) • Alessia Cattabriga (University of Bologna) • Antonio Costa (UNED, Madrid) • Massimo Ferri (University of Bologna) • Luca Lionni (University of Heidelberg) • Josè Maria Montesinos Amilibia (Real Academia de Ciencias Exactas, Físicas y Naturales de España) • Daniele Zuddas (University of Trieste) The conference will also host a poster session. During the preliminary event (which will take place in Modena on June 8 afternoon, at the Department FIM) young researchers who intend to present a poster will be invited to give short talks on their own research. In this occasion, we foresee ample room for discussion and informal interaction in order to facilitate the scientific exchange between participants. More information and the detailed programme can be found at the webpage https://sites.google.com/view/gras70/ Participants are requested to register at https://sites.google.com/view/gras70/registration and fill the related form. No registration fee is required. The deadline for talk/poster submission and registration is April 30, 2023. A limited amount of funding is available for early-career researchers intending to participate in the session of talks and to present posters. Application for funding can be made through the registration form. Finally, we would like to ask you to forward the announcement to any of your colleagues who might be interested. We look forward to meeting you at the conference. *Maria Rita Casali* *(on behalf of the Organisers)*

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Fwd: Conference: Probability and Geometry in, on and of non-Euclidian spaces at CIRM
by Bruno Martelli 04 Apr '23

04 Apr '23

---------- Forwarded message --------- From: Bram Petri <brampetri(a)gmail.com> Date: Mon, Apr 3, 2023 at 3:21 PM Subject: Conference: Probability and Geometry in, on and of non-Euclidian spaces at CIRM To: Bram Petri <brampetri(a)gmail.com> Dear all, I'm writing to advertise a conference at CIRM that we're organizing with Nicolas Curien, Elba Garcia-Failde and Arvind SIngh. It's called " *Probability** and Geometry in, on and of non-Euclidian spaces*". For more information, see here: https://conferences.cirm-math.fr/2897.html <https://es.sonicurlprotection-fra.com/click?PV=2&MSGID=20230403132100014094…> We have some funding available for accommodation, but most probably not for travel. If you know anyone who might be interested, please don't hesitate to spread the word! Best wishes, Bram

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I: Postdoc position in Symplectic Topology at IMPA
by Paolo Lisca 04 Apr '23

04 Apr '23

Inoltro annuncio di posizione post-doc in topologia simplettica. Buona giornata, Paolo Lisca -------------------- Da: Vinicius G. B. Ramos <vgbramos(a)impa.br> Oggetto: Postdoc position in Symplectic Topology at IMPA Dear colleagues, We invite applications for a postdoctoral position in symplectic topology at IMPA in Rio de Janeiro. The starting date is between 1 October 2023 and 31 March 2024. The duration is one year with a possible extension to a second year. Candidates should email Vinicius Ramos (vgbramos(a)impa.br<mailto:vgbramos@impa.br>) as soon as possible including the following documents: 1) CV including a list of publications 2) Research statement 3) List of references Best regards, Vinicius Ramos

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Seminario di geometria domani
by Filippo Bianchi 29 Mar '23

29 Mar '23

Buonasera, Vi annunciamo il seminario di geometria di domani. Ricordiamo che l'elenco completo dei seminari si trova a questa pagina<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. A presto, Filippo, Alice e Giuseppe ----- 30-Mar-2023 - 11:00 Sala Seminari (Dip. Matematica) Linear programming for hyperbolic surfaces Bram Petri IMJ Paris I will speak about extremal problems in the (spectral) geometry of hyperbolic surfaces and how linear programming methods based on the Selberg trace formula can help. I will not assume any familiarity with hyperbolic geometry or the Selberg trace formula. This is joint work with Maxime Fortier Bourque.

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Fwd: Summer school "Involutions in algebraic geometry and gauge theory", Nantes Université, 2023 May 30-June 2
by Bruno Martelli 27 Mar '23

27 Mar '23

Inoltro info su summer school Bruno ---------- Forwarded message --------- From: Erwan Brugallé <Erwan.Brugalle(a)math.cnrs.fr> Date: Mon, Mar 27, 2023 at 7:32 AM Subject: Summer school "Involutions in algebraic geometry and gauge theory", Nantes Université, 2023 May 30-June 2 To: Marco GOLLA <Marco.Golla(a)univ-nantes.fr>, Erwan Brugallé < Erwan.Brugalle(a)math.cnrs.fr> ################## # Second announcement ################## Dear colleagues, We are organising a summer school on "Involutions in algebraic geometry and gauge theory" at the University of Nantes (May 30-June 2, 2023). There will be two mini-courses, one by Matilde Manzaroli (Tübingen University) on real algebraic curves and one by Christopher Scaduto (University of Miami) on 4-manifolds and involutions. We expect to have some contributed talks by young participants. Master students are particularly encouraged to apply. The schedule will be pretty light, in order to allow the participants ample time to work on the material covered in the lectures. Some familiarity with knot theory and with (very basic) complex projective geometry will be assumed. You can find more information on the webpage of the school: https://es.sonicurlprotection-fra.com/click?PV=2&MSGID=20230327053200063942… The registration page is here: https://es.sonicurlprotection-fra.com/click?PV=2&MSGID=20230327053200063942… and the registration deadline is March 30, 2022. Could you pass this information on to any PhD student/postdoc/motivated Master student who might be interested in attending? Limited funding is available for Master students and for contributed speakers. However, should funding be an insurmountable issue, do ask them to get in touch (math.summer-school (at) univ-nantes.fr). Thank you! The organisers, Erwan Brugallé and Marco Golla

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Seminari di Geometria
by Bruno Martelli 10 Mar '23

10 Mar '23

Buondì, Inoltro un avviso riguardante i prossimi seminari di geometria, che per qualche motivo tecnico non è comparso nella mailing list. Ne approfitto per ringraziare gli organizzatori. Bruno ---- Carə tuttə, Siamo felici di annunciare che dal 30 marzo ripartiranno i Seminari di geometria. Per questo semestre, i talk si terranno il giovedì mattina alle 11.00 in Aula Seminari. I primi incontri saranno i seguenti: 30 Marzo - *Bram Petri* (Institut de Mathématiques de Jussieu), *Linear programming for hyperbolic surfaces* 06 Aprile - *Antonio Alfieri* (Université du Québec à Montréal), *TBA* 13 Aprile - *Raphael Zentner* (Durham University),* TBA* Maggiori informazioni saranno caricate sulla pagina del dipartimento <https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Alice Merz Filippo Bianchi Giuseppe Bargagnati

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Minicorsi Baby Geometri
by Giovanni Italiano 10 Feb '23

10 Feb '23

Buongiorno, vorremmo segnalare due minicorsi organizzati dai Baby Geometri, ovvero Alessandro Sisto (Heriot-Watt University) Mapping Class Groups and relatives: hierarchically hyperbolic spaces. Lukas Lewark (University of Regensburg) An introduction to Khovanov homology and its applications. I minicorsi si svolgeranno nei seguenti orari: Lewark: 27 Febbraio 11-13, 28 Febbraio 11-13, 1 Marzo 11-13, 3 Marzo 9-11, sempre in Aula Riunioni Sisto: 1 Marzo 14-16, 2 Marzo 11-13, 3 Marzo 14-16 sempre in Aula Riunioni Invitiamo eventuali interessati (ad uno dei minicorsi o ad entrambi) a rispondere a questa mail; per motivi organizzativi, chiediamo di farci sapere entro martedì 14 Febbraio. A presto, Alice, Filippo, Giovanni e Giuseppe

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3 giorni di geometria e topologia a Bologna a marzo
by Stefano Riolo 11 Jan '23

11 Jan '23

Dear all, we are pleased to announce the following workshops in Bologna: ----------------------------------------- 1) Manifolds and groups in Bologna (Workshop funded by GNSAGA (INdAM)) Date: Wednesday, Mar 22, 2023 -- Thursday, Mar 23, 2023 Place: Bologna - Dipartimento di Matematica The aim of this workshop is to bring together young researchers working in low-dimensional topology and geometric group theory in a broad sense. The event consists in main lectures and shorter talks in order to give the opportunity to young researchers to present their own research. The workshop is hosted by the University of Bologna and it is sponsored by the GNSAGA (INdAM). After the workshop, the University of Bologna will host the Attività presso l’Unità di Ricerca INdAM “Non-positive curvature in manifolds and groups” (March 24, 2023), sponsored by INdAM. This one-day event will consist in four main lectures given by international speakers. Main speakers: Gianluca Faraco (Università di Milano Bicocca) Francesco Fournier Facio (ETH Zürich) Alessio Savini (Univeristé de Genève) Junior speakers: Federica Bertolotti (SNS Pisa) Viola Giovannini (Université du Luxembourg) Giovanni Italiano (SNS Pisa) Bianca Marchionna (Università di Milano Bicocca) Matteo Migliorini (SNS Pisa) Francesco Milizia (SNS Pisa) Diego Santoro (SNS Pisa) Matteo Tarocchi (Università di Pavia) Enrico Trebeschi (Università di Pavia) Organizers Ludovico Battista, Stefano Francaviglia, Marco Moraschini, Stefano Riolo (Alma Mater Studiorum Università di Bologna) and Filippo Sarti (Università di Torino) website: https://math.unibo.it/en/events/manifolds-and-groups-in-bologna ----------------------------------------- 2) Non-positive curvature in manifolds and groups (Attività presso l'Unità di Ricerca INdAM di Bologna) Date: Friday, Mar 24, 2023 Place: Bologna - Dipartimento di Matematica The aim of this event is to bring together researchers working in geometric topology and geometric group theory, mainly focusing on non-positive curvature phenomena. It is hosted by the University of Bologna and sponsored by INdAM. Before this event, the University of Bologna will host the workshop “Manifolds and groups in Bologna” (March 22-23, 2023, sponsored by GNSAGA — INdAM ), on the same research themes, particularly addressed to the participation and interaction of young researchers. Speakers: Caterina Campagnolo (UAM - Universidad Autónoma de Madrid) Irene Pasquinelli (University of Bristol) Andrea Seppi (Université Grenoble Alpes) Leone Slavich (Università di Pavia) Organizers Pierluigi Contucci (direttore dell'UdR INdAM di Bologna), Ludovico Battista, Stefano Francaviglia, Marco Moraschini, Stefano Riolo (Alma Mater Studiorum Università di Bologna) e Filippo Sarti (Università di Torino) website: https://matematica.unibo.it/it/eventi/udr-indam-bo-2023-03-24 We are looking forward to seeing you in Bologna. Best regards, The organizers

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[Indico] James Lewis, The Complexity of Higher Chow Groups, 30/11/2022, 16:30 Europe/Rome
by francesco.sala＠unipi.it 28 Nov '22

28 Nov '22

Title: The Complexity of Higher Chow Groups, Speaker(s): James Lewis, University of Alberta, Date and time: 30 Nov 2022, 16:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/127 Abstract -------- Let $X/{\mathbb C}$ be a smooth projective variety. We consider two integral invariants, one of which is the level of the Hodge cohomology algebra $H^*(X,{\mathbb C})$ and the other involving the complexity of the higher Chow groups ${\rm CH}^*(X,m;{\mathbb Q})$ for $m\geq 0$. We conjecture that these two invariants are the same and accordingly provide some strong evidence in support of this. -- Indico :: Email Notifier https://events.dm.unipi.it/e/127

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[Indico] Antonella Grassi, A family of threefolds with remarkable properties (namely: the unreasonable effectiveness of the Schoens), 30/11/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 28 Nov '22

28 Nov '22

Title: A family of threefolds with remarkable properties (namely: the unreasonable effectiveness of the Schoens), Speaker(s): Antonella Grassi, Università degli Studi di Bologna, Date and time: 30 Nov 2022, 15:00 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/115 Abstract -------- The fiber product of certain rational elliptic surfaces were first studied by Schoen in the 80s to answer questions from string theory. Over the decades the “Schoens” have provided evidence for various conjectures as well as counterexamples to others. I will discuss these conjectures, the unusual features of the Schoens, and present other open questions. -- Indico :: Email Notifier https://events.dm.unipi.it/e/115

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Seminario 27/10/2021
by Tamas Szamuely 25 Nov '22

25 Nov '22

Cari tutti, ecco il programma del prossimo seminario di geometria algebrica e aritmetica di Pisa: Mercoledì 27 ottobre 2021, Dipartimento di matematica, Aula Magna 15:00--16:00 Valerio Melani (Pisa): The Poisson structure on the affine Grassmannian via derived algebraic geometry Motivated by a conjecture of Kapranov-Ginzburg-Vasserot, we will explain how to reinterpret the classical Poisson structure on the affine Grassmannian using tools from derived symplectic (and Poisson) geometry. Our approach is based on the study of symplectic structures on derived stacks whose cotangent complex is not perfect, and therefore uses in a crucial way the formalism of Tate modules. The talk is based on joint work with Mauro Porta and Pavel Safronov. Homepage del seminario: http://pagine.dm.unipi.it/tamas/saga.html Migliori saluti, Tamás Szamuely

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[Indico] Anton Mellit, P=W via $H_2$, 24/11/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 23 Nov '22

23 Nov '22

Title: P=W via $H_2$, Speaker(s): Anton Mellit, University of Vienna, Date and time: 24 Nov 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/108 Abstract -------- By $H_2$ we denote the Lie algebra of polynomial hamiltonian vector fields on the plane. We consider the moduli space of stable twisted Higgs bundles on an algebraic curve of a given coprime rank and degree. De Cataldo, Hausel and Migliorini proved in the case of rank 2 and conjectured in arbitrary rank that two natural filtrations on the cohomology of the moduli space coincide. One is the weight filtration W coming from the Betti realization, and the other one is the perverse filtration P induced by the Hitchin map. Motivated by computations of the Khovanov-Rozansky homology of links by Gorsky, Hogancamp and myself, we look for an action of $H_2$ on the cohomology of the moduli space. We find it in the algebra generated by two kinds of natural operations: on the one hand, we have the operations of cup product by tautological classes, and on the other hand, we have the Hecke operators acting via certain correspondences. We then show that both P and W coincide with the filtration canonically associated to the $\mathfrak{sl}_2$ subalgebra of $H_2$.Based on joint work with Hausel, Minets and Schiffmann. -- Indico :: Email Notifier https://events.dm.unipi.it/e/108

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[Indico] Andrea Ricolfi, Quot schemes and their d-critical structure(s), 23/11/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 21 Nov '22

21 Nov '22

Title: Quot schemes and their d-critical structure(s), Speaker(s): Andrea Ricolfi, SISSA, Trieste, Date and time: 23 Nov 2022, 15:00 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/116 Abstract -------- D-critical schemes and Artin stacks were introduced by Joyce in 2015, and play a central role in Donaldson-Thomas theory. They typically occur as truncations of (-1)-shifted symplectic derived schemes, but the problem of constructing the d-critical structure on a “DT moduli space” without passing through derived geometry (which is hard) is wide open. We discuss this problem, and new results in this direction, when the moduli space is the Quot scheme of points on a Calabi-Yau 3-fold. Joint work with Michail Savvas. -- Indico :: Email Notifier https://events.dm.unipi.it/e/116

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[Indico] Anton Mellit, P=W via $H_2$, 24/11/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 18 Nov '22

18 Nov '22

Title: P=W via $H_2$, Speaker(s): Anton Mellit, University of Vienna, Date and time: 24 Nov 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/108 Abstract -------- By $H_2$ we denote the Lie algebra of polynomial hamiltonian vector fields on the plane. We consider the moduli space of stable twisted Higgs bundles on an algebraic curve of a given coprime rank and degree. De Cataldo, Hausel and Migliorini proved in the case of rank 2 and conjectured in arbitrary rank that two natural filtrations on the cohomology of the moduli space coincide. One is the weight filtration W coming from the Betti realization, and the other one is the perverse filtration P induced by the Hitchin map. Motivated by computations of the Khovanov-Rozansky homology of links by Gorsky, Hogancamp and myself, we look for an action of $H_2$ on the cohomology of the moduli space. We find it in the algebra generated by two kinds of natural operations: on the one hand, we have the operations of cup product by tautological classes, and on the other hand, we have the Hecke operators acting via certain correspondences. We then show that both P and W coincide with the filtration canonically associated to the $\mathfrak{sl}_2$ subalgebra of $H_2$.Based on joint work with Hausel, Minets and Schiffmann. -- Indico :: Email Notifier https://events.dm.unipi.it/e/108

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[Indico] Rouven Frassek, Baxter Q-operators, QQ-systems and the shifted Yangian, 17/11/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 16 Nov '22

16 Nov '22

Title: Baxter Q-operators, QQ-systems and the shifted Yangian, Speaker(s): Rouven Frassek, Università di Modena e Reggio Emilia, Date and time: 17 Nov 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/123 Abstract -------- I plan to discuss the construction of Baxter Q-operators within the framework of the Quantum Inverse Scattering Method. The method follows the standard procedure for the transfer matrix construction of spin chains that was developed by Faddeev and collaborators but employs Lax matrices with an infinite-dimensional auxiliary space. Those Lax matrices do not fit into the standard Yangian of Drinfeld but can be understood in the context of the shifted Yangian. The Q-operators satisfy a set of functional relations that are known as QQ-relations that can be seen as the successor of the famous Bethe equations. In the case of the Yangian of $\mathsf{su}(n)$, the full set of functional relations can be derived from the Q-operators. Beyond $\mathsf{su}(n)$ new obstacles arise in the construction of Q-operators which will be discussed in the example of $\mathsf{so}(2r)$. -- Indico :: Email Notifier https://events.dm.unipi.it/e/123

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[Indico] Rouven Frassek, Baxter Q-operators, QQ-systems and the shifted Yangian, 17/11/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 11 Nov '22

11 Nov '22

Title: Baxter Q-operators, QQ-systems and the shifted Yangian, Speaker(s): Rouven Frassek, Università di Modena e Reggio Emilia, Date and time: 17 Nov 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/123 Abstract -------- I plan to discuss the construction of Baxter Q-operators within the framework of the Quantum Inverse Scattering Method. The method follows the standard procedure for the transfer matrix construction of spin chains that was developed by Faddeev and collaborators but employs Lax matrices with an infinite-dimensional auxiliary space. Those Lax matrices do not fit into the standard Yangian of Drinfeld but can be understood in the context of the shifted Yangian. The Q-operators satisfy a set of functional relations that are known as QQ-relations that can be seen as the successor of the famous Bethe equations. In the case of the Yangian of $\mathsf{su}(n)$, the full set of functional relations can be derived from the Q-operators. Beyond $\mathsf{su}(n)$ new obstacles arise in the construction of Q-operators which will be discussed in the example of $\mathsf{so}(2r)$. -- Indico :: Email Notifier https://events.dm.unipi.it/e/123

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[Indico] David Harari, Arithmetic of homogeneous spaces over global fields of characteristic p, 09/11/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 07 Nov '22

07 Nov '22

Title: Arithmetic of homogeneous spaces over global fields of characteristic p, Speaker(s): David Harari, Université de Paris-Saclay, Date and time: 9 Nov 2022, 15:00 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/110 Abstract -------- Let $K$ be the function field of a curve over a finite field. Let $X$ be a homogeneous space of a reductive group over $K$. We discuss cohomological obstructions to the local-global principle on $X$. Similar results for weak and strong approximation will also be provided (joint work with Cyril Demarche). -- Indico :: Email Notifier https://events.dm.unipi.it/e/110

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Fwd: annoucement - GEOMETRIC REPRESENTATION THEORY AND QUANTUM TOPOLOGY
by Francesco Sala 05 Nov '22

05 Nov '22

Da Olivier Schiffmann: --- Bonjour, un workshop intitulé GEOMETRIC REPRESENTATION THEORY AND QUANTUM TOPOLOGY aura lieu a l'université Paris-Cité du 12 au 16 Decembre prochain. Plus d'informations sont disponibles sur la page web http://georep22.imj-prg.fr Amicalement, Eric Vasserot --- Ciao, Francesco

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[Indico] Miroslav Rapcak, Coherent Sheaves, Quivers and Affine-Yangian Representations, 03/11/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 02 Nov '22

02 Nov '22

Title: Coherent Sheaves, Quivers and Affine-Yangian Representations, Speaker(s): Miroslav Rapcak, CERN, Date and time: 3 Nov 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Seminari`). You can access the full event here: https://events.dm.unipi.it/e/124 Abstract -------- According to the famous result of Schiffmann and Vasserot, the cohomology of the ADHM moduli space carries the structure of an affine-Yangian module. For the purpose of our talk, it is useful to view this moduli space from a three-dimensional perspective of the derived category of coherent sheaves on $\mathbb{C}^3$. More concretely, one can interpret the ADHM moduli space as parametrizing extensions of a coherent sheaf on $\mathbb{C^2}\subset \mathbb{C}^3$ by skyscraper sheaves. It is then natural to ask whether exchanging such a "framing" non-compact sheaf by a different one leads to other representations of the algebra. In this talk, I am going to give an overview of some of the developments in this direction and comment on various predictions originating from physics. -- Indico :: Email Notifier https://events.dm.unipi.it/e/124

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Seminario topologia mercoledì
by Bruno Martelli 31 Oct '22

31 Oct '22

Buondì, Scusandomi per lo scarsissimo preavviso, annuncio un seminario di geometria e topologia per mercoledì (dopodomani). Siete tutti invitati, Bruno ----- Orario e luogo: 2 Novembre 2022, 16:00 - 17:00, Aula Seminari Speaker: Francesco Costantino (Toulouse) Title: Stated skein algebras Abstract: In this talk I will recall the notion of skein algebra and skein module of surfaces and of three-manifolds and I will introduce the recent idea of stated skein algebra and module. After discussing the interest of these objects with respect to the « standard » ones, I will discuss some key examples and some applications. Most of the material I will present is joint work with Thang Le.

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Double conference: June 2023 in Pisa
by Enrico Le Donne 31 Oct '22

31 Oct '22

Dear colleagues, We cordially invite you to attend a double event held at the De Giorgi Center of the SNS Pisa in June 2023. a) workshop "subRiemannian geometry and beyond, III" from 19th - 23rd June, 2023. https://sites.google.com/view/srgb3pisa2023 b) conference "Geometry and analysis of groups and manifolds" from 26th - 30th June, 2023. https://sites.google.com/view/geometryandanalysis/ The first meeting is the 3rd organized within the ERC project GeoMeG (Geometry of Metric Groups). The general plan is to bring together international researchers working in various areas of mathematics with connections to sub-Riemannian geometry or, more generally, metric geometry. The idea for this meeting is to focus on the large-scale geometry of nilpotent groups, Heintze groups and their boundaries, and the geometry of solvable groups or, more generally, the large-scale geometry of Lie groups. There will be introductory courses in the first two days, and conference talks for the next 3 days. The second conference will bring together world-leading experts on Geometric Analysis, Analysis on Metric Spaces, and Geometric Group Theory. These fields have seen rapid progress in recent years, both individually and in interaction, solving major open questions and opening up exciting new avenues of inquiry. Informally, the conference will also celebrate the contributions of Bruce Kleiner to these areas. Further information about registration and potential funding for junior participants will be available on the webpages. On behalf of the organizers. -- Enrico Le Donne

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Fwd: Postdoc positions at IHES
by Bruno Martelli 31 Oct '22

31 Oct '22

Inizio messaggio inoltrato: *Da: *Fanny Kassel <kassel(a)ihes.fr> *Oggetto: **Postdoc positions at IHES* *Data: *28 ottobre 2022, 11:18:06 CEST *A: *Fanny Kassel <kassel(a)ihes.fr> Dear colleagues, I hope this email finds you well. I would like to advertize that this year we are hiring five postdocs in mathematics at IHES: https://www.ihes.fr/en/applications/#post-docs Excellent candidates working on groups, geometry, and dynamics are strongly encouraged to apply. Particular attention will be paid to candidates who already have some experience working on one of the following topics: discrete subgroups of Lie groups, Teichmüller or higher Teichmüller theory, dynamics on character varieties, geometric structures on manifolds (hyperbolic geometry, convex projective geometry, Lorentzian or more generally pseudo-Riemannian geometry, etc.). The application deadline is 29 November 2022. Please feel free to pass on the information to anyone who might be interested. Best regards, Fanny Kassel

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[Indico] Miroslav Rapcak, Coherent Sheaves, Quivers and Affine-Yangian Representations, 03/11/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 28 Oct '22

28 Oct '22

Title: Coherent Sheaves, Quivers and Affine-Yangian Representations, Speaker(s): Miroslav Rapcak, CERN, Date and time: 3 Nov 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Seminari`). You can access the full event here: https://events.dm.unipi.it/e/124 Abstract -------- According to the famous result of Schiffmann and Vasserot, the cohomology of the ADHM moduli space carries the structure of an affine-Yangian module. For the purpose of our talk, it is useful to view this moduli space from a three-dimensional perspective of the derived category of coherent sheaves on $\mathbb{C}^3$. More concretely, one can interpret the ADHM moduli space as parametrizing extensions of a coherent sheaf on $\mathbb{C^2}\subset \mathbb{C}^3$ by skyscraper sheaves. It is then natural to ask whether exchanging such a "framing" non-compact sheaf by a different one leads to other representations of the algebra. In this talk, I am going to give an overview of some of the developments in this direction and comment on various predictions originating from physics. -- Indico :: Email Notifier https://events.dm.unipi.it/e/124

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[Indico] Vijaylaxmi Trivedi, Hilbert-Kunz density function and its applications to some Hilbert-Kunz multiplicity conjectures, 26/10/2022, 16:30 Europe/Rome
by francesco.sala＠unipi.it 24 Oct '22

24 Oct '22

Title: Hilbert-Kunz density function and its applications to some Hilbert-Kunz multiplicity conjectures, Speaker(s): Vijaylaxmi Trivedi, Tata Institute of Fundamental Research, India, Date and time: 26 Oct 2022, 16:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Scuola Normale Superiore, Pisa (Aula Mancini). You can access the full event here: https://events.dm.unipi.it/e/106 Abstract -------- In this talk we introduce a compactly supported and real valued continuous function called Hilbert-Kunz (HK) density function. We briefly describe its properties and its applications to study characteristic p-invariants like HK multiplicity and F -thresholds.Further we discuss in more detail some long standing conjectures of Watanabe-Yoshida and Yoshida on the HK multiplicities of quadric hypersurfaces.Here, using the classification of ACM bundles on the smooth quadric via matrix factorizations, we describe the HK density functions of the quadrics. The structure of the function explains the difficulties in nailing down the computations of HK multiplicities of even such simple class of rings.As a corollary we prove a part of the Watanabe-Yoshida conjecture for all dimensions. Moreover, for large p, we give a closed formula for HK multiplicities of quadrics hypersurfaces and a proof of Yoshida’s conjecture. -- Indico :: Email Notifier https://events.dm.unipi.it/e/106

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[Indico] Vasudevan Srinivas, On finite presentation for the tame fundamental group, 26/10/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 24 Oct '22

24 Oct '22

Title: On finite presentation for the tame fundamental group, Speaker(s): Vasudevan Srinivas, Tata Institute of Fundamental Research, India, Date and time: 26 Oct 2022, 15:00 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Scuola Normale Superiore, Pisa (Aula Mancini). You can access the full event here: https://events.dm.unipi.it/e/105 Abstract -------- This is a report on joint work with H. Esnault and M. Schusterman.Recall that the étale fundamental group of a variety over an algebraically closed field of characteristic 0 is known to be a finitely presented profinite group; this is proved by first reducing to varieties over the complex numbers, and then comparing with the topological fundamental group. In positive characteristics, even if we restrict to smooth varieties, finite generation fails in general for étale fundamental groups of non-proper varieties (eg, for the affine line).For a smooth variety with a smooth, projective compactification with an SNC boundary divisor, we show that the tame fundamental group is a finitely presented profinite group. In particular, this holds for the étale fundamental groups of smooth projective varieties. -- Indico :: Email Notifier https://events.dm.unipi.it/e/105

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[Indico] Andrea Ricolfi, TBA, 23/11/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 21 Oct '22

21 Oct '22

Title: TBA, Speaker(s): Andrea Ricolfi, SISSA, Trieste, Date and time: 23 Nov 2022, 15:00 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/116 -- Indico :: Email Notifier https://events.dm.unipi.it/e/116

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[Indico] Michael Wemyss, Hyperplane arrangements, monodromy via deformation theory, and stability conditions, 20/10/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 19 Oct '22

19 Oct '22

Title: Hyperplane arrangements, monodromy via deformation theory, and stability conditions, Speaker(s): Michael Wemyss, University of Glasgow, Date and time: 20 Oct 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/31 Abstract -------- The infinite hyperplane arrangements associated to affine Dynkin diagrams (and their associated braid groups) are fundamental throughout mathematics. I will explain a variation on this, which allows us to produce many more arrangements. Whilst these new arrangements need not be Coxeter, they are still "labelled" by Coxeter data. The motivation comes from algebraic geometry. In that setting, monodromy around these hyperplanes corresponds to certain symmetries, which are realised using (noncommutative) deformation theory of curves. The hyperplanes turn out to control the Bridgeland stability manifold, and this in turn relates to open questions around the $K(\pi,1)$-conjecture. This is summary of joint work with Donovan, Iyama, and Hirano. -- Indico :: Email Notifier https://events.dm.unipi.it/e/31

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[Indico] Ádám Gyenge, The Heisenberg category of a category, 19/10/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 17 Oct '22

17 Oct '22

Title: The Heisenberg category of a category, Speaker(s): Ádám Gyenge, Alfréd Rényi Institute of Mathematics, Date and time: 19 Oct 2022, 15:00 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/111 Abstract -------- The Heisenberg algebra associated with a lattice is a much-investigated object originating in quantum theory. Khovanov introducedrecently a categorification of the infinite Heisenberg algebraassociated with the free boson or, equivalently, a rank 1 lattice,using a graphical construction involving planar diagrams. We extendKhovanov’s graphical construction to derived categories of smooth andprojective varieties or, more generally, to categories having a Serrefunctor. In our case, the underlying lattice will be the (numerical)Grothendieck group of the category. We also obtain a 2-representationof our Heisenberg category on a categorical analogue of the Fockspace. Joint work with Clemens Koppensteiner and Timothy Logvinenko. -- Indico :: Email Notifier https://events.dm.unipi.it/e/111

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[Indico] Michael Wemyss, Hyperplane arrangements, monodromy via deformation theory, and stability conditions, 20/10/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 14 Oct '22

14 Oct '22

Title: Hyperplane arrangements, monodromy via deformation theory, and stability conditions, Speaker(s): Michael Wemyss, University of Glasgow, Date and time: 20 Oct 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/31 Abstract -------- The infinite hyperplane arrangements associated to affine Dynkin diagrams (and their associated braid groups) are fundamental throughout mathematics. I will explain a variation on this, which allows us to produce many more arrangements. Whilst these new arrangements need not be Coxeter, they are still "labelled" by Coxeter data. The motivation comes from algebraic geometry. In that setting, monodromy around these hyperplanes corresponds to certain symmetries, which are realised using (noncommutative) deformation theory of curves. The hyperplanes turn out to control the Bridgeland stability manifold, and this in turn relates to open questions around the $K(\pi,1)$-conjecture. This is summary of joint work with Donovan, Iyama, and Hirano. -- Indico :: Email Notifier https://events.dm.unipi.it/e/31

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Fwd: Colloquio di Matematica del Dini
by Marco Abate 08 Oct '22

08 Oct '22

Carissimi, vi giro questo annuncio di seminario a Firenze. Ciao, Marco > > > ---------- Forwarded message --------- > From: Daniele Angella <daniele.angella(a)unifi.it> > Date: Mon, Oct 3, 2022 at 2:43 PM > Subject: Colloquio di Matematica del Dini > To: <dimai-news-group(a)unifi.it>, <dimai-dottorandi-group(a)unifi.it>, > <dimai-seminari-group(a)unifi.it> > Cc: Matteo Focardi <matteo.focardi(a)unifi.it>, Eugenio Giannelli > <eugenio.giannelli(a)unifi.it> > > > Carissime/i, > > il secondo "Colloquio di Matematica del Dini" sarà venerdì 28 ottobre, > in aula 202 del DiMaI, alle ore 14:30, tenuta dalla Prof.ssa Claire > Voisin (Institut de Mathématiques de Jussieu): > > On the topology of hyper-Kähler manifolds > > Abstract: Hyper-Kähler manifolds are symplectic holomorphic compact > Kähler manifolds, a particular class of complex manifolds with trivial > canonical bundle. They form a very restricted class, both from the > Riemannian and complex geometry viewpoints. They also satisfy strong > topological restrictions that I will describe, and that follow from > the study of their deformations. I will also explain further > restrictions in dimension $4$, and a classification result obtained in > collaboration with Debarre, Huybrechts and Macrì. > > > Siete tutte/i pregate/i di pubblicizzare l'iniziativa fra gli studenti > e le studentesse, esortandoli a partecipare (riceveranno comunque a > breve una mail in merito). > > In allegato trovate la locandina dell'evento. > > > Cari saluti, > > Daniele, Eugenio, Matteo Prorettore per la Didattica Università di Pisa ********************************************************** Marco Abate Tel: +39/050/2213.230 Dipartimento di Matematica Fax: +39/050/2210.678 Universita' di Pisa Largo Pontecorvo 5 E-mail: marco.abate(a)unipi.it 56127 Pisa Italy Web: pagine.dm.unipi.it/abate/ **********************************************************

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[Indico] Lorenzo Venturello, Flag spheres and $\gamma$-positivity, 06/10/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 05 Oct '22

05 Oct '22

Title: Flag spheres and $\gamma$-positivity, Speaker(s): Lorenzo Venturello, Università di Pisa, Date and time: 6 Oct 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/107 Abstract -------- The $f$-vector of a simplicial complex is the vector whose entries record the number of faces in each dimension. It is typically convenient to study an integer linear transformation of the $f$-vector, called the $h$-vector, which naturally appears in the Hilbert series of an algebra associated to the simplicial complex. When we impose additional topological or combinatorial property on the complex, we observe linear relations or inequalities among the entries of the $h$-vector. For instance, when the complex triangulates a sphere, the $h$-vector is nonnegative, palindromic and unimodal. In this talk I will focus on a special family of triangulated spheres called flag and I will introduce a conjecture due to Gal which predicts precise linear inequalities which are stronger then thos ein the case of arbitrary spheres. Gal's inequalites can be conveniently encoded as statements of nonnegativity of a third integer vector, called $\gamma$-vector. I will show that a natural algebraic generalization of this conjecture does not hold (joint work with Alessio D'Alì) and comment on a reduction strategy proposed by Chudnowsky and Nevo (joint work in progress with Geva Yashfe). Finally, if time permits, I will present recent progress on a different $\gamma$-positivity problem involving triangulations of symmetric edge polytopes of a graph (joint work with Alessio D'Alì, Martina Juhnke-Kubitzke and Daniel Köhne). -- Indico :: Email Notifier https://events.dm.unipi.it/e/107

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Seminari Baby Geometri
by Giovanni Italiano 03 Oct '22

03 Oct '22

Cari tutti, care tutte, Vi scriviamo per informarvi che anche quest’anno organizziamo i seminari del Baby Geometri, un ciclo di seminari che ha lo scopo di approfondire argomenti classici o tematiche di ricerca nell'ambito della Geometria e della Topologia. I nostri seminari sono rivolti principalmente a studenti della magistrale e del dottorato (ma sono aperti a chiunque più in generale a chiunque sia interessato agli argomenti), conterranno una parte introduttiva apprezzabile da tutti e non saranno mai eccessivamente tecnici. I seminari si terranno in presenza, nelle aule del Dipartimento di Matematica o della Normale (variabile di settimana in settimana, a seconda della situazione), generalmente il martedì alle 14:30. Per il momento prevediamo anche di continuare a trasmetterli anche online via Microsoft Teams. Il primo seminario si terrà domani (martedì 4 ottobre) alle 14:30 in Aula Seminari (DM): Jeronimo Garcia Mejia (Karlsruher Institut für Technologie) The geometry of the Word Problem We will review a classical problem in group theory, the so-called Word Problem, from a geometric perspective by relating it to an even older geometric problem, the Isoperimetric Problem. The main actor being Dehn functions. We will talk about an interesting class of groups and review what is known about their Dehn functions and present some recent progress. If time allows it we will discuss the ideas behind it which will serve as an excuse to talk about an interesting open problem. Vi lascio un breve elenco degli speaker successivi, e ne approfitto per ricordarvi che potete sempre consultare il nostro sito http://people.dm.unipi.it/babygeometri/ per avere un programma aggiornato. venerdì 14 ottobre (online) - Oğuz Şavk (Stanford University / Boğaziçi University) martedì 18 ottobre - Laura Marino (Institut de Mathématiques de Jussieu) martedì 25 ottobre - Andrea Tamburelli (Università di Pisa) Nel caso desideriate essere aggiunti ad una mailing list con i reminder settimanali, potete rispondere a questa mail e vi aggiungeremo. A presto, Giuseppe Bargagnati Filippo Bianchi Giovanni Italiano Alice Merz Diego Santoro

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[Indico] Sam DeHority, Hecke correspondences and Lagrangian fibrations, 05/10/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 03 Oct '22

03 Oct '22

Title: Hecke correspondences and Lagrangian fibrations, Speaker(s): Sam DeHority, Columbia University, Date and time: 5 Oct 2022, 15:00 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/104 Abstract -------- I will discuss a method to associate new algebraic structures with deformations to certain holomorphic Lagrangian fibrations, and describe their relation with other parts of mathematical physics. This algebraic structure controls the enumerative geometry of the variety admitting the Lagrangian fibration in a way analogous to how a quantum group controls the enumerative geometry of a symplectic singularity. Various questions, including the monodromy of the quantum differential equation, can be answered using local-to-global techniques. -- Indico :: Email Notifier https://events.dm.unipi.it/e/104

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Leiden - Assistant or Associate professor in Algebra, Geometry and Number Theory
by Francesco Sala 01 Oct '22

01 Oct '22

Da parte di Francesca Arici (Leiden): --- Vacancy - Assistant or Associate professorship in Algebra, Geometry and Number Theory: https://www.universiteitleiden.nl/en/vacancies/2022/kwartaal-3/22-619assist… --- A presto, Francesco

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[Indico] Lorenzo Venturello, Flag spheres and $\gamma$-positivity, 06/10/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 30 Sep '22

30 Sep '22

Title: Flag spheres and $\gamma$-positivity, Speaker(s): Lorenzo Venturello, Università di Pisa, Date and time: 6 Oct 2022, 15:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/107 Abstract -------- The $f$-vector of a simplicial complex is the vector whose entries record the number of faces in each dimension. It is typically convenient to study an integer linear transformation of the $f$-vector, called the $h$-vector, which naturally appears in the Hilbert series of an algebra associated to the simplicial complex. When we impose additional topological or combinatorial property on the complex, we observe linear relations or inequalities among the entries of the $h$-vector. For instance, when the complex triangulates a sphere, the $h$-vector is nonnegative, palindromic and unimodal. In this talk I will focus on a special family of triangulated spheres called flag and I will introduce a conjecture due to Gal which predicts precise linear inequalities which are stronger then thos ein the case of arbitrary spheres. Gal's inequalites can be conveniently encoded as statements of nonnegativity of a third integer vector, called $\gamma$-vector. I will show that a natural algebraic generalization of this conjecture does not hold (joint work with Alessio D'Alì) and comment on a reduction strategy proposed by Chudnowsky and Nevo (joint work in progress with Geva Yashfe). Finally, if time permits, I will present recent progress on a different $\gamma$-positivity problem involving triangulations of symmetric edge polytopes of a graph (joint work with Alessio D'Alì, Martina Juhnke-Kubitzke and Daniel Köhne). -- Indico :: Email Notifier https://events.dm.unipi.it/e/107

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Seminario sistemi dinamici giovedì prossimo
by Bruno Martelli 12 Sep '22

12 Sep '22

Carissimi, Inoltro avviso di seminario per giovedì prossimo, A presto, Bruno Martelli Carissimi, vi segnalo il seguente seminario che sarà tenuto da Fabrizio Bianchi (Université de Lille) in Sala Seminari giovedì 15 settembre alle ore 14:00: Holomorphic motions of Julia sets: dynamical stability in one and several complex variables Abstract: We discuss the stability of holomorphic dynamical systems under perturbation. In dimension 1, the theory is now classical and is based on works by Lyubich, Mané-Sad-Sullivan and DeMarco. I will review this theory and present a recent generalisation valid in any dimension. Since classical 1-dimensional techniques no longer apply in higher dimensions, our approach is based on ergodic and pluripotential methods. Pur essendo inserito nel ciclo di seminari di Sistemi Dinamici, penso possa essere di interesse anche per i geometri. Ciao e a presto, Marco Prorettore per la Didattica Università di Pisa ********************************************************** Marco Abate Tel: +39/050/2213.230 Dipartimento di Matematica Fax: +39/050/2210.678 Universita' di Pisa Largo Pontecorvo 5 E-mail: marco.abate(a)unipi.it <marco.abate(a)unipi.it> 56127 Pisa Italy Web: pagine.dm.unipi.it/abate/ **********************************************************

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I: Ph.D.-position at Utrecht University (possibly in symplectic geometry), deadline September 15, please forward
by Paolo Lisca 12 Jul '22

12 Jul '22

Inoltro annuncio di borsa di dottorato a Utrecht. Paolo Lisca ________________________________ Da: Ziltener, F.J. (Fabian) <F.Ziltener(a)uu.nl> Oggetto: Ph.D.-position at Utrecht University (possibly in symplectic geometry), deadline September 15, please forward Dear colleagues, At the mathematics department of Utrecht University (The Netherlands) there is a Ph.D.-position available, see the attachment. Please forward this information to master's students who are looking for a Ph.D.-position in symplectic geometry. * The deadline is September 15. Best regards, Fabian Ziltener https://es.sonicurlprotection-fra.com/click?PV=2&MSGID=20220712114944066056…

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Fwd: Announcement - Garcia-Prada's conference
by Francesco Sala 30 Jun '22

30 Jun '22

Da parte di Luis Alvarez-Consul: > === > > Subject: Conference in honour of Oscar Garcia-Prada on the occasion of his > 60th birthday > > Moduli spaces and geometric structures > Conference in honour of Oscar Garcia-Prada on the occasion of his 60th > birthday > > Dates: 12-16 September 2022 > > Venue: ICMAT, Madrid, Spain > > Website: https://www.icmat.es/congresos/2022/modOGP60/ > > This conference is a celebration of the work and 60th birthday of Oscar > Garcia-Prada. It is devoted to the theory of moduli spaces and geometric > structures, with particular emphasis on the broad area of research > interests of Professor Garcia-Prada. > > The event will take place at ICMAT (Madrid, Spain). Lectures will start on > the morning of Monday 12th of September and will end on the evening of > Friday 16th of September. > > The following speakers have confirmed their participation in the > conference: > > Jørgen Ellegaard Andersen (QM, Univ. Southern Denmark) > Olivier Biquard (Sorbonne & Univ. Paris) > Indranil Biswas (TIFR, Mumbai) > Steven Bradlow (Univ. Illinois Urbana-Champaign) > Brian Collier (Univ. California Riverside) > Andrew Dancer (Univ. Oxford) > Mario García-Fernández (ICMAT–UAM Madrid) > Peter Gothen (Univ. Porto) > Tamás Hausel (IST Austria) > Jochen Heinloth (Univ. Duisburg-Essen) > Nigel Hitchin (Univ. Oxford) > Jacques Hurtubise (McGill Univ.) > Ignasi Mundet i Riera (Univ. Barcelona) > Ngô Bảo Châu (Univ. Chicago) (TBC) > André Oliveira (Univ. Porto & UTAD) > Ana Peón-Nieto (Univ. Birmingham & Côte d'Azur) > S. Ramanan (CMI Chennai) > Dietmar Salamon (ETZ Zürich) > Mariano Santander (Univ. Valladolid) > Alexander Schmitt (FU Berlin) > Carlos Simpson (Univ. Côte d'Azur) > Richard Wentworth (Univ. Maryland) > Anna Wienhard (Univ. Heidelberg) > > More information, including registration, can be found at > https://www.icmat.es/congresos/2022/modOGP60/ > > Sponsors: > > ICMAT Severo Ochoa Programme > Ministerio de Ciencia e Innovacion (Spain) > > We hope to see you in September in Madrid. > > The organizing committee: > > Luis Alvarez-Consul (ICMAT) > Tomas L. Gomez (ICMAT)

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[Indico] Justin Sawon, Mirror symmetry for generalized Kummer varieties, 29/06/2022, 15:30 Europe/Rome
by francesco.sala＠unipi.it 28 Jun '22

28 Jun '22

Title: Mirror symmetry for generalized Kummer varieties, Speaker(s): Justin Sawon, University of North Carolina at Chapel Hill, USA, Date and time: 29 Jun 2022, 15:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Riunioni). You can access the full event here: https://events.dm.unipi.it/e/99 Abstract -------- The generalized Kummer variety $K_n$ of an abelian surface $A$ is the fibre of the natural map $\mathsf{Hilb}^{n+1}A\to \mathsf{Sym}^{n+1}A\to A$. Debarre described a Lagrangian fibration on $K_n$ whose fibres are the kernels of $\mathsf{Jac}C\to A$, where $C$ are curves in a fixed linear system in $A$. In this talk we consider the dual of the Debarre system, constructed in a similar way to the duality between $\mathsf{SL}$- and $\mathsf{PGL}$-Hitchin systems described by Hausel and Thaddeus. We conjecture that these dual fibrations are mirror symmetric, in the sense that their (stringy) Hodge numbers are equal, and we verify this in a few cases. In fact, there is another isotrivial Lagrangian fibration on $K_n$. We can describe its dual fibration and verify the mirror symmetry relation in many more cases. -- Indico :: Email Notifier https://events.dm.unipi.it/e/99

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[Indico] Nicola Tarasca, Geometry of vertex operator algebras on moduli of curves, 29/06/2022, 14:30 Europe/Rome
by francesco.sala＠unipi.it 28 Jun '22

28 Jun '22

Title: Geometry of vertex operator algebras on moduli of curves, Speaker(s): Nicola Tarasca, Virginia Commonwealth University, Date and time: 29 Jun 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Riunioni). You can access the full event here: https://events.dm.unipi.it/e/87 Abstract -------- The physically-inspired theory of conformal blocks allows one to construct vector bundles on moduli spaces of curves with remarkable geometric and combinatorial properties. This theory uses as input the representations of some non-commutative algebras. A classical example is provided by the representations of affine Lie algebras, and the resulting vector bundles have been studied at great length in the last thirty years, yielding extraordinary insights on moduli spaces of curves. In this talk, I will present how some fundamental results of the classical theory of conformal blocks extend to the more general setting provided by replacing affine Lie algebras with vertex operator algebras. Specifically, I will discuss an extended factorization property and new cohomological field theories. This is joint work with Chiara Damiolini and Angela Gibney. -- Indico :: Email Notifier https://events.dm.unipi.it/e/87

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[Indico] Justin Sawon, TBA, 29/06/2022, 15:30 Europe/Rome
by francesco.sala＠unipi.it 22 Jun '22

22 Jun '22

Title: TBA, Speaker(s): Justin Sawon, University of North Carolina at Chapel Hill, USA, Date and time: 29 Jun 2022, 15:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Riunioni). You can access the full event here: https://events.dm.unipi.it/e/99 Abstract -------- TBA -- Indico :: Email Notifier https://events.dm.unipi.it/e/99

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[Indico] Nicola Tarasca, Geometry of vertex operator algebras on moduli of curves, 29/06/2022, 14:30 Europe/Rome
by francesco.sala＠unipi.it 22 Jun '22

22 Jun '22

Title: Geometry of vertex operator algebras on moduli of curves, Speaker(s): Nicola Tarasca, Virginia Commonwealth University, Date and time: 29 Jun 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Department of Mathematics (Aula Riunioni). You can access the full event here: https://events.dm.unipi.it/e/87 Abstract -------- The physically-inspired theory of conformal blocks allows one to construct vector bundles on moduli spaces of curves with remarkable geometric and combinatorial properties. This theory uses as input the representations of some non-commutative algebras. A classical example is provided by the representations of affine Lie algebras, and the resulting vector bundles have been studied at great length in the last thirty years, yielding extraordinary insights on moduli spaces of curves. In this talk, I will present how some fundamental results of the classical theory of conformal blocks extend to the more general setting provided by replacing affine Lie algebras with vertex operator algebras. Specifically, I will discuss an extended factorization property and new cohomological field theories. This is joint work with Chiara Damiolini and Angela Gibney. -- Indico :: Email Notifier https://events.dm.unipi.it/e/87

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Edging Higher - ICMS-Sofia Inaugural Conference - July 11 – 14, 2022 - Sofia, Bulgaria
by Francesco Sala 11 Jun '22

11 Jun '22

Annuncio da parte di Peter Dalakov: --- Edging Higher - ICMS-Sofia Inaugural Conference - July 11 – 14, 2022 - Sofia, Bulgaria In luglio vi sarà il convegno inaugurale del centro ICMS-Sofia gestito da Ludmil Katzarkov a Sofia. Tra gli speakers, vi saranno: Kontsevich, Griffiths, Fukaya, etc. Maggiori informazioni sul sito https://icms.bg/edging-higher/ (Sono disponibili dei fondi per supportare i partecipanti giovani.) -- A presto, Francesco

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Seminario di Matematica - Marco Volpe (Università di Regensburg)
by Guglielmo Nocera 02 Jun '22

02 Jun '22

*Avviso seminario* Lunedì 6 giugno 2022 alle ore *14:00* in aula Tonelli (SNS) *Marco Volpe*, dell'Università di Regensburg, terrà un seminario dal titolo *Formalismo dei sei funtori e dualità di Atiyah per varietà topologiche* Abstract: In topologia il formalismo dei sei funtori, originariamente introdotto da Grothendieck nel contesto algebro-geometrico, consiste di un insieme di operazioni tra categorie derivate di fasci in gruppi abeliani, attraverso le quali è possibile dedurre le proprietà principali della coomologia singolare, tra cui la dualità di Poincaré. In questo talk spiegheremo come estendere il formalismo a fasci a valori in spettri, utilizzando il linguaggio delle ∞-categorie. Come applicazione otterremo una generalizzazione della dualità di Atiyah per sommersioni topologiche proprie, usando una costruzione fascio-teoretica dello spettro di Thom di un microfibrato. Prerequisiti: Categorie triangolate, funtori aggiunti, un primo corso in topologia algebrica, coomologia, spettri, fasci su spazi topologici. L'impostazione del seminario sarà tale da non assumere confidenza con il linguaggio delle ∞-categorie. Guglielmo Nocera Scuola Normale Superiore di Pisa - IRMA Strasbourg | PhD Candidate in Mathematics http://uz.sns.it/~Wilhelm795/

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Seminario
by Andrea Tamburelli 31 May '22

31 May '22

Buongiorno, Vi segnalo un seminario questo pomeriggio in aula riunioni. Saluti, Andrea ______________________________________________________________________________________________ 31 Maggio 2022, 16:30 - 17:30, Aula Riunioni Nicholas Rungi (SISSA) Titolo: Pseudo-Kähler geometry of properly convex projective structures in a linear case Abstract: In this talk we will define a pseudo-Kähler structure on the deformation space of properly convex projective structures over the 2-dimensional torus. The symplectic form and the pseudo-Riemannian metric are both compatible with the complex structure inherited from the identification of this space with the total space of the holomorphic vector bundle of cubic differentials over Teichmuller space. I will also explain briefly what we expect in higher genus and the strategy to solve the problem. This is the first part of an ongoing PhD research project under the supervision of Dr. A. Tamburelli.

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Fwd: [gdrtresses] Post-doctoral position Leeds
by Bruno Martelli 30 May '22

30 May '22

Post-doc position in Leeds ---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Mon, May 30, 2022 at 9:30 AM Subject: [gdrtresses] Post-doctoral position Leeds To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> Dear all, Would you be able to help us advertise these two postdoctoral positions in the University of Leeds? (Or apply to them?) These positions will be supported by the EPSRC programme grant: "Combinatorial Representation Theory: Discovering the Interfaces of Algebra with Geometry and Topology" https://sites.google.com/view/crt-leeds There will be more positions opening in the future. So do keep us on the radar for future opportunities. Best wishes Joao Faria Martins http://www1.maths.leeds.ac.uk/~pmtjfa/

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Seminario di geometria
by Bruno Martelli 29 May '22

29 May '22

Buondì, Segnalo un seminario di geometria per il prossimo mercoledì. A presto, Bruno Martelli ---- 1 Giugno 2022, 16:00 - 17:00, Aula Seminari Francesco Lin (Columbia) Titolo: Equazioni di Seiberg-Witten e 3-varietà iperboliche Abstract: Un interessante problema aperto in topologia in dimensione bassa è quello di capire possibili interazioni fra l’omologia di Floer e gli invarianti geometrici di varietà iperboliche. Per esempio, un quesito base è quello di determinare si possano inferire o meno informazioni riguardo all’omologia di Floer da quantità come il volume, il raggio di iniettività e le lunghezze delle geodetiche. Nel seminario discuterò qualche risultato parziale in questa direzione ottenuto in una serie di lavori con M. Lipnowski.

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I: inizio minicorso di dottorato
by Tamas Szamuely 28 May '22

28 May '22

MINICORSO DI DOTTORATO SU UNA VERSIONE COMOLOGICA DELLA TEORIA DI HODGE NON ABELIANA Mark De Cataldo (Stony Brook) 4 lezioni Prima lezione lunedi` 30 maggio, ore 10, aula seminari, Dipartimento di Matematica. Una breve descrizione del programma la trovate nel file allegato. Prego tutti di inoltrare il messaggio a potenziali interessati e in particolare Luca Bruni di inoltrarlo alla mailing list dei perzionandi. Grazie.

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Seminario 31 maggio
by Andrea Tamburelli 26 May '22

26 May '22

Cari colleghi, Nicholas Rungi, un dottorando della SISSA che sto seguendo, e' qui in visita settimana prossima. Avevo pensato che potrebbe dare un seminario martedi pomeriggio, che mi pare essere libero da eventi. Volevo pero' prima essere sicuro che ci sara' un pubblico, visto che siamo vicini al ponte del 2 giugno ed e' stato organizzato all'ultimo momento. Vi prego di farmi sapere se potrete essere presenti. Trovate qui sotto titolo e abstract. Saluti, Andrea _______________________________________________________________________________________ *Title: Pseudo-Kähler geometry of properly convex projective structures in a linear case* *Abtract:* In this talk I will present a first result obtained in a joint work with A. Tamburelli. We define a pseudo-Kähler structure on the deformation space of properly convex projective structures over the 2-dimensional torus. The symplectic form and the pseudo-Riemannian metric are both compatible with the complex structure inherited from the identification of this space with the total space of the holomorphic vector bundle of cubic differentials over Teichmuller space. I will also explain briefly what we expect in higher genus and the strategy to solve the problem. This is the first part of an ongoing PhD research project under the supervision of Dr. A. Tamburelli.

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[Indico] Leonid Rybnikov, Kashiwara crystals and the moduli space of stable rational curves, 25/05/2022, 16:00 Europe/Rome
by francesco.sala＠unipi.it 24 May '22

24 May '22

Title: Kashiwara crystals and the moduli space of stable rational curves, Speaker(s): Leonid Rybnikov, HSE University, Faculty of Mathematics, Moscow, Date and time: 25 May 2022, 16:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Aula Riunioni (Department of Mathematics). You can access the full event here: https://events.dm.unipi.it/e/92 Abstract -------- The category of Kashiwara crystals for a semisimple complex Lie algebra $\mathfrak{g}$ is a combinatorial model of the tensor category of finite-dimensional $\mathfrak{g}$-modules, where $\mathfrak{g}$-modules are represented by colored oriented graphs with the weight vectors being represented by points (marked by the weights of the representation), and the action of the Chevalley generators being represented by arrows (marked by simple roots). Kashiwara crystals form a monoidal category in which the tensor product is not symmetric, but the tensor products of two crystals in different orders are still connected by some functorial isomorphism called commuter. This structure is similar to braiding in the category of representations of the quantum group $U_q(\mathfrak{g})$ (and, in fact, comes from it), but the commutator do not satisfy the braid group relation. In particular, on the tensor power of a given crystal, all possible commutors generate not the action of the braid group $B_n$, but the action of another group $J_n$, called the cactus group -- the $S_n$-equivariant fundamental group of $\overline{M_{0 ,n+1}}(\mathbb{R})$, the Deligne-Mumford compactification of the moduli spaces of real stable rational curves with $n+1$ marked points. Such monoidal categories are called coboundary. I will describe a general construction of a coboundary monoidal category as a family of compatible coverings over real Deligne-Mumford spaces, thus explaining the appearance of the real Deligne-Mumford compactification in this context. This construction also explains how Kashiwara crystals arise in quantum integrable systems, such as the Gaudin magnet chain. This helps to compute some monodromy of solutions of Bethe ansatz equations for quantum magnet chains. I will show how this works in the example $\mathfrak{g}=\mathfrak{sl}_2$ which is already interesting and sufficiently general. (joint work with Joel Kamnitzer, Iva Halacheva, and Alex Weekes, arXiv:1708.05105) -- Indico :: Email Notifier https://events.dm.unipi.it/e/92

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[Indico] Siddharth Mathur, Searching for the impossible Azumaya algebra, 25/05/2022, 14:30 Europe/Rome
by francesco.sala＠unipi.it 24 May '22

24 May '22

Title: Searching for the impossible Azumaya algebra, Speaker(s): Siddharth Mathur, Orsay, Date and time: 25 May 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Scuola Normale Superiore (Aula Volterra). You can access the full event here: https://events.dm.unipi.it/e/72 Abstract -------- In two 1968 seminars, Grothendieck used the framework of etale cohomology to extend the definition of the Brauer group to all schemes. Over a field, the objects admit a well-known algebro-geometric description: they are represented by $\mathbb{P}^n$-bundles (equivalently: Azumaya algebras). Despite the utility and success of Grothendieck's definition, an important foundational aspect remains open: is every cohomological Brauer class over a scheme represented by a $\mathbb{P}^n$-bundle? It is not even known if smooth proper threefolds over the complex numbers have enough Azumaya algebras! In this talk, I will outline a strategy to construct a Brauer class that cannot be represented by an Azumaya algebra. Although the candidate is algebraic, the method will leave the category of schemes and use formal-analytic line bundles to create Brauer classes. I will then explain a strange criterion for the existence of a corresponding Azumaya algebra. At the end, I will reveal the unexpected conclusion of the experiment. -- Indico :: Email Notifier https://events.dm.unipi.it/e/72

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[Indico] Giulio Bresciani, Two results about Grothendieck's Section Conjecture, 18/05/2022, 14:30 Europe/Rome
by francesco.sala＠unipi.it 17 May '22

17 May '22

Title: Two results about Grothendieck's Section Conjecture, Speaker(s): Giulio Bresciani, SNS Pisa, Date and time: 18 May 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Dipartimento di Matematica (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/73 Abstract -------- Grothendieck's Section Conjecture states that, if $X$ is an hyperbolic curve over a field $k$ finitely generated over $\mathbb{Q}$, every section of the map $\pi_1(X) \to \mathsf{Gal}(k)$ is associated with a rational point of the completion of $X$. After summarizing the main known facts concerning the conjecture, we will present two new results. First, we generalize to number fields a theorem which was proved over $\mathbb{Q}$ by Stix: we prove that if $k$ is a number field and the Weil restriction of $X$ to $\mathbb{Q}$ admits a rational map to a non-trivial Brauer-Severi variety, then $X$ satisfies the conjecture. Secondly, if $k$ is finitely generated over $\mathbb{Q}$, we prove that the conjecture holds for sections which satisfy a strong birationality assumption. In particular, this implies that the section conjecture is equivalent to Esnault and Hai's cuspidalization conjecture, which states that every Galois section of every hyperbolic curve $X$ lifts to every open subset of $X$. -- Indico :: Email Notifier https://events.dm.unipi.it/e/73

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Fwd: A postdoc position
by Stefano Riolo 07 May '22

07 May '22

Segnalo post-doc di 2 anni in Corea dal Sud, su (G,X)-strutture, senza insegnamento. La data d'inizio a settembre è indicativa: pare si possa rinviare di massimo mezzo anno. Eventualmente contattare Gye-Seon Lee (http://www.math.snu.ac.kr/~gyeseonlee/) all'indirizzo gyeseonlee(a)snu.ac.kr Buon finesettimana, Stefano -------- Messaggio Inoltrato -------- Hi Stefano, As I told you before, I'm looking for candidates for a two-year postdoc position at the Department of Mathematical Sciences of Seoul National University, starting from September 2022. The funding comes from my research grant "A study on convex real projective Dehn filling". The annual salary is approximately 65000000 Won (roughly 48000 Euro) before taxes. There is no teaching duty. I hope that candidates have good research potential with interests in geometric structures on manifolds and representation spaces. Best, Gye-Seon

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[Indico] Luca Schaffler, Boundary divisors in the stable pair compactification of the moduli space of Horikawa surfaces, 04/05/2022, 14:30 Europe/Rome
by francesco.sala＠unipi.it 03 May '22

03 May '22

Title: Boundary divisors in the stable pair compactification of the moduli space of Horikawa surfaces, Speaker(s): Luca Schaffler, Roma 3, Date and time: 4 May 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Dipartimento di Matematica (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/71 Abstract -------- Smooth minimal surfaces of general type with $K^2=1$, $p_g=2$, and $q=0$ constitute a fundamental example in the geography of algebraic surfaces, and the 28-dimensional moduli space $M$ of their canonical models admits a geometric and modular compactification $\overline{M}$ by stable surfaces. Franciosi-Pardini-Rollenske classified the Gorenstein stable degenerations parametrized by it, and jointly with Rana they determined boundary divisors parametrizing irreducible stable surfaces with a unique T-singularity. In this talk, we continue with the investigation of the boundary of $\overline{M}$ constructing eight new irreducible boundary divisors parametrizing reducible surfaces. Additionally, we study the relation with the GIT compactification of $M$ and the Hodge theory of the degenerate surfaces that the eight divisors parametrize. This is joint work in progress with Patricio Gallardo, Gregory Pearlstein, and Zheng Zhang. -- Indico :: Email Notifier https://events.dm.unipi.it/e/71

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Fwd: Concorso RTDB trieste
by Bruno Martelli 02 May '22

02 May '22

Buondì, Segnalo un RTD-B in Geometria a Trieste A presto, Bruno Martelli ---------- Forwarded message --------- Cari colleghi, vi inoltro l'annuncio di un concorso da RTDB per Geometria a Trieste con scadenza 12/5 (https://web.units.it/node/44270/ricerca/pub) con la preghiera di diffondere la notizia tra chi potrebbe essere interessato. Grazie mille, Alessia

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Seminario mercoledì prossimo
by Bruno Martelli 29 Apr '22

29 Apr '22

Buondì, Segnalo un seminario di geometria per mercoledì prossimo. A presto, Bruno 04-May-2022 - 16:00 Sala Seminari (Dip. Matematica) Simplicial volume and aspherical manifolds Marco Moraschini Simplicial volume is a homotopy invariant for compact manifolds introduced by Gromov in the early 80s. It measures the complexity of a manifold in terms of singular simplices. Since simplicial volume behaves similarly to the Euler characteristic, a natural problem is to understand the relation between these two invariants. More precisely, a celebrated question by Gromov (~’90) asks whether all oriented closed connected aspherical manifolds with zero simplicial volume also have vanishing Euler characteristic. In this talk, we will describe the problem and we will show counterexamples to some variations of the previous question. Moreover, we will describe some new strategies to approach the problem as well as the relation between Gromov’s question and other classical problems in topology. This is part of a joint work with Clara Löh and George Raptis.

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Fwd: Postdoc position at Università di Firenze
by Bruno Martelli 27 Apr '22

27 Apr '22

---------- Forwarded message --------- From: Daniele Angella <daniele.angella(a)unifi.it> Date: Wed, Apr 27, 2022 at 5:47 PM Subject: Postdoc position at Università di Firenze To: geometriaglobale(a)lists.math.unifi.it < geometriaglobale(a)lists.math.unifi.it>, geometriaglobale-group(a)unifi.it < geometriaglobale-group(a)unifi.it> Cc: Fabio Podesta' <fabio.podesta(a)unifi.it> Dear all, We are looking for candidates for a Postdoc position at Università di Firenze, Italy, starting from July. The position is partially supported by the Project "Real and Complex Manifolds: Topology, Geometry and Holomorphic Dynamics". The call is open until the deadline May 29th, 2022: https://titulus.unifi.it/albo/viewer?view=files%2F004521290-UNFICLE-55ffded… The call is in Italian - feel free to contact us in case you need help on translation or if you want more information. Please forward the announcement to potential candidates! All the best,

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workshop on Recent advances in bounded cohomology
by Marco Moraschini 26 Apr '22

26 Apr '22

Dear all, We are pleased to announce a workshop on *Recent Advances in Bounded Cohomology* to be held at the University of Regensburg during *September 26-30, 2022*, funded by the SFB Higher Invariants of the University of Regensburg. The aim of this workshop is to bring together researchers in bounded cohomology theory and related fields and discuss recent developments. In addition to the invited talks, there will be opportunities for researchers to give contributed talks and ample time for discussions and collaboration. The workshop will be held in a hybrid format. Our speakers are: - Jonathan Bowden (University of Regensburg) - Michelle Bucher (University of Geneva) - Caterina Campagnolo (UAM Madrid) - Francesco Fournier-Facio (ETH Zürich) - Roberto Frigerio (University of Pisa) - Jean-François Lafont (Ohio State University) - Michał Marcinkowski (University of Wrocław) - Nicolas Monod (EPFL) - Sam Nariman (Purdue University) - Chricton Ogle (Ohio State University) - Roman Sauer (KIT) More information and the registration form are available on the conference website: https://www-app.uni-regensburg.de/Fakultaeten/MAT/sfb-higher-invariants/ind… If you have any questions, please do not hesitate to contact the organizers. We look forward to seeing you in September! Best regards, the organizers, Clara Löh, Marco Moraschini and George Raptis

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[Indico] Marco D'Addezio, Parabolicity conjecture of F-isocrystals, 27/04/2022, 14:30 Europe/Rome
by francesco.sala＠unipi.it 26 Apr '22

26 Apr '22

Title: Parabolicity conjecture of F-isocrystals, Speaker(s): Marco D'Addezio, Université de Paris, Date and time: 27 Apr 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Dipartimento di Matematica (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/70 Abstract -------- In the last years the theory of crystalline cohomology and F-isocrystals had a great development. I will present a new result concerning the algebraic monodromy groups of F-isocrystals. I will start with a quick introduction on crystalline cohomology, F-isocrystals, and overconvergent F-isocrystals. Subsequently, I will recall the definition of monodromy groups of F-isocrystals (which uses the theory of Tannakian categories) and in the end I will explain the main theorem, the applications, and some ideas of the proof. -- Indico :: Email Notifier https://events.dm.unipi.it/e/70

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Annuncio Seminario Caputi
by Carlo Collari 12 Apr '22

12 Apr '22

Buongiorno a tutti, inoltro l'annuncio del seminario di Luigi Caputi che si terrà domani (13 Aprile 2022) alle 16:00 nell'Aula Magna del Dipartimento. In allegato titolo e abstract Saluti, Carlo Collari Titolo: Coarse Homology Theories Relatore: Luigi Caputi (University of Aberdeen) Abstract: Coarse spaces, first introduced by J. Roe for studying index-type theorems, have recently found applications also in K-theory and assembly map conjectures. The main tool in such applications is given by coarse homology theories, homological invariants of coarse spaces. Goal of the talk is to define coarse homology theories using the homotopical approach developed by U. Bunke and A. Engel. The main example will be coarse algebraic K-theory.

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[Indico] Logarithmic Comparison Theorems for Hyperplane Arrangements, Twisted or Otherwise, Dan Bath, 08/04/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 07 Apr '22

07 Apr '22

Title: Logarithmic Comparison Theorems for Hyperplane Arrangements, Twisted or Otherwise, Speaker(s): Dan Bath, KU Leuven, Date and time: 8 Apr 2022, 15:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Riunioni). You can access the full event here: https://events.dm.unipi.it/e/88 -- Indico :: Email Notifier https://events.dm.unipi.it/e/88

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[Indico] Logarithmic Comparison Theorems for Hyperplane Arrangements, Twisted or Otherwise, Dan Bath, 08/04/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 06 Apr '22

06 Apr '22

Title: Logarithmic Comparison Theorems for Hyperplane Arrangements, Twisted or Otherwise, Speaker(s): Dan Bath, KU Leuven, Date and time: 8 Apr 2022, 15:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Riunioni). You can access the full event here: https://events.dm.unipi.it/e/88 -- Indico :: Email Notifier https://events.dm.unipi.it/e/88

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Fwd: [gdrtresses] Conference "Three day summer school on The Geometry and Dynamics of Moduli Spaces"
by Bruno Martelli 05 Apr '22

05 Apr '22

---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Tue, Apr 5, 2022 at 11:35 AM Subject: [gdrtresses] Conference "Three day summer school on The Geometry and Dynamics of Moduli Spaces" To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> Conference "Three day summer school on The Geometry and Dynamics of Moduli Spaces" We are announcing a short school in Geometry ad Dynamics of Moduli Spaces, to be held in June in Bologna. Here the web page: https://site.unibo.it/geometry-dynamics-summer-school-2022/en Registration is free but mandatory, here https://site.unibo.it/geometry-dynamics-summer-school-2022/en/registration

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[Indico] Lecture: Variation of stable birational type and bounds for complete intersections (06/04/2022, 14:30 Europe/Rome)
by francesco.sala＠unipi.it 05 Apr '22

05 Apr '22

Title: Variation of stable birational type and bounds for complete intersections, Speaker(s): Johannes Nicaise, KU Leuven and Imperial College London, Date and time: 6 Apr 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Dipartimento di Matematica (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/69 Abstract -------- This talk is based on joint work with John Christian Ottem. I will explain a generalization of results by Shinder on variation of stable birational types in degenerating families, and how this can be used to extend Schreieder's non-stable rationality bounds from hypersurfaces to complete intersections in characteristic zero. This technique yields new results already for complete intersections of quadrics. -- Indico :: Email Notifier https://events.dm.unipi.it/e/69

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Fwd: [gdrtresses] Conference: "Complex Hyperbolic geometry and related topics"
by Bruno Martelli 29 Mar '22

29 Mar '22

---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Mon, Mar 28, 2022 at 8:29 AM Subject: [gdrtresses] Conference: "Complex Hyperbolic geometry and related topics" To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> We are organising a conference "Complex Hyperbolic geometry and related topics" at the CIRM, in Luminy, from 4 to 8th of July 2022, in honor of ELisha Falbel. You are warmly welcome to participate and promote this event. The preregistration is open at https://conferences.cirm-math.fr/2622.html The deadline for registration is 6 of June. Limited financial support is available mostly intended for PhD students and young researchers.

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[Indico] Lecture: Local positivity and effective Diophantine approximation (23/03/2022, 14:30 Europe/Rome)
by francesco.sala＠unipi.it 22 Mar '22

22 Mar '22

Title: Local positivity and effective Diophantine approximation, Speaker(s): Matthias Nickel, Pisa, Date and time: 23 Mar 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Dipartimento di Matematica (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/74 Abstract -------- In this talk I will discuss a new approach to prove effective results in Diophantine approximation relying on lower bounds of Seshadri constants. I will then show how to use it to prove an effective theorem on the simultaneous approximation of two algebraic numbers satisfying an algebraic equation -- Indico :: Email Notifier https://events.dm.unipi.it/e/74

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Seminario mercoledì ore 16
by Bruno Martelli 21 Mar '22

21 Mar '22

Buondì, Con colpevole ritardo, segnalo un seminario di geometria per mercoledì prossimo (dopodomani). A presto, Bruno SEMINARI DI GEOMETRIA 23-Mar-2022 - 16:00 Aula Magna - Dipartimento di Matematica Titolo: An arithmetic, hyperbolic, rational homology 3-sphere that bounds geometrically Leonardo Ferrari, Neuchatel (Svizzera) Abstract: In this seminar, we'll introduce Davis and Januszkiewicz combinatorial techniques for building manifolds from right-angled polytope, as well as some topological properties inherited by these manifolds. We'll then present some obstructions to producing rational homology 3-spheres (QHS3) in this setting, and explain how to use these obstructions to improve tree-search algorithms for hyperbolic QHS3. We'll finally explain how to promote geodesical embeddings to geometrical bounds, and combine these tools to construct the first example of a hyperbolic, arithmetic, QHS3 that bounds geometrically.

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Fwd: [SPAM]Conference announcement
by Bruno Martelli 16 Mar '22

16 Mar '22

---------- Forwarded message --------- From: Costantino <francesco.costantino(a)math.univ-toulouse.fr> Date: Tue, Mar 15, 2022 at 10:23 PM Subject: [SPAM]Conference announcement To: Bruno Martelli <bruno.martelli(a)unipi.it>, Roberto Frigerio < roberto.frigerio(a)unipi.it>, Stefano Francaviglia < stefano.francaviglia(a)unibo.it>, Carlo Petronio <carlo.petronio(a)unipi.it>, Gabriele Mondello <mondello(a)mat.uniroma1.it>, Francesco Bonsante < bonfra07(a)unipv.it> Dear all We are organising a conference in honor of Vladimir Turaev: Quantum Topology and Geometry in Paris, Institut Henri Poincaré from 13t to 17th of June 2022. You are warmly welcome to participate and promote this event. The registration is open at https://www.mathconf.org/qtg2022. The deadline for registration is 30th of April (31th of march for demands of financial suport for students and post-docs). The poster is attached to this email. For information concerning the covid travel regulation in France please visit: https://www.interieur.gouv.fr/covid-19-international-travel Our best wishes Alexis Virelizier, Christian Blanchet, Emmanuel Wagner, François Costantino and Nathan Geer

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[Indico] [Event reminder] Two results about Grothendieck's Section Conjecture (16/03/2022, 14:30 Europe/Rome)
by francesco.sala＠unipi.it 15 Mar '22

15 Mar '22

Please note that the event "Two results about Grothendieck's Section Conjecture" will start on 16 Mar 2022, 14:30 (Europe/Rome). It will take place at Dipartimento di Matematica (Aula Magna). You can access the full event here: https://indico.cs.dm.unipi.it/e/73 Description ----------- Grothendieck's Section Conjecture states that, if $X$ is an hyperbolic curve over a field $k$ finitely generated over $\mathbb{Q}$, every section of the map $\pi_1(X) \to \mathsf{Gal}(k)$ is associated with a rational point of the completion of $X$. After summarizing the main known facts concerning the conjecture, we will present two new results. First, we generalize to number fields a theorem which was proved over $\mathbb{Q}$ by Stix: we prove that if $k$ is a number field and the Weil restriction of $X$ to $\mathbb{Q}$ admits a rational map to a non-trivial Brauer-Severi variety, then $X$ satisfies the conjecture. Secondly, if $k$ is finitely generated over $\mathbb{Q}$, we prove that the conjecture holds for sections which satisfy a strong birationality assumption. In particular, this implies that the section conjecture is equivalent to Esnault and Hai's cuspidalization conjecture, which states that every Galois section of every hyperbolic curve $X$ lifts to every open subset of $X$. -- Indico :: Email Notifier https://indico.cs.dm.unipi.it/e/73

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Seminario di Combinatoria, Teoria di Lie e Topologia - 3 Marzo 2022 - Nicoletta Cantarini
by Francesco Sala 02 Mar '22

02 Mar '22

Carə tuttə, Vi scrivo per annunciarvi che domani vi sarà un seminario per il ciclo di seminari "Seminario di Combinatoria, Teoria di Lie e Topologia” di Pisa. Il seminario si svolgerà in Aula Riunioni dalle 15 alle 16. L'oratrice è Nicoletta Cantarini (Università di Bologna). — Titolo: Verma modules for the Lie superalgebra E(5,10) Abstract: in this talk we will describe the construction of the so-called finite Verma modules for Z-graded Lie superalgebras and study the finite Verma modules over the exceptional linearly compact Lie superalgebra E(5,10). This is done through the classification of singular vectors. We will show that the corresponding morphisms of Verma modules can be arranged in an infinite number of bilateral infinite complexes which can be viewed as "exceptional" de Rham complexes for E(5,10). — Vi prego di inoltrare questo messaggio a tuttə coloro che ritenete possano essere interessatə. Sperando di vedervi numerosə, vi mando i miei saluti, A presto, Francesco

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