Geometria_Pisa

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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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