Geometria_Pisa

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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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