- Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

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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