Geometria_Pisa

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Seminario di Combinatoria, Teoria di Lie e Topologia - 25 Novembre 2021 - Kyoji Saito
by Francesco Sala 22 Nov '21

22 Nov '21

Carə tuttə, Vi scrivo per annunciarvi che questo giovedì vi sarà un seminario in presenza per il ciclo di seminari "Seminario di Combinatoria, Teoria di Lie e Topologia” di Pisa. Il seminario si svolgerà in Aula Magna dalle 15 alle 17 (con una breve pausa in mezzo). L'oratore è Kyoji Saito (Kavli IPMU, Tokyo). — Titolo: Elliptic Artin Monoids and Higher Homotopy Groups Abstract: A half century ago when simply elliptic singularity was introduced, it was a natural question whether its discriminant complement is a K(π, 1) space. At that time, Fulvio Lazzeri suggested a possibility of existence of a non-trivial π2 class by a heuristic argument on the real discriminant complement. In the present talk, I approach this problem from elliptic Artin monoids, where the monoid is defined by generalizing the classical Artin braid relations to the new relations, called elliptic braid relations, defined on elliptic diagrams. Contraly to the classical Artin monoids, the elliptic Artin monoids are not cancellative and their natural homomorphisms to elliptic Artin groups (=the fundamental groups of the elliptic discriminant complements) are not injective (except for rank 1 case). This fact leads to me to a construction of π2-classes in the complement of the discriminant. We conjecture that they are non-vanishing. Then, we reformulate the classical K(π, 1)-conjecture for complements of discriminants, whether the discriminant complements are homotopic to classifying spaces associated to the elliptic Artin monoids. — (Qualora pensiate di venire, per aiutarmi nella stesura del documento di tracciamento, vi prego di iscrivervi qui) Vi prego di inoltrare questo messaggio a tutti coloro che ritenete possano essere interessati. Sperando di vedervi numerosi, vi mando i miei saluti, Francesco

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Fwd: [gdrtresses] 4-manifolds: from above and below
by Bruno Martelli 13 Nov '21

13 Nov '21

Conference on 4-manifolds at Luminy. Bruno ---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Fri, Nov 12, 2021 at 5:41 PM Subject: [gdrtresses] 4-manifolds: from above and below To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> Dear all, Together with Ana Lecuona and Stefan Friedl, we are organising a conference entitled "4-manifolds: from above and below" that will take place during the week of 12-16 September 2022 at the CIRM in Luminy, not far from Marseille: https://conferences.cirm-math.fr/2593.html We would be grateful if you could share this announcement with your students, postdocs, and topology-inclined colleagues! We hope to see you there, or at some point in the near future! Ana, Anthony and Stefan

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Master a Marsiglia
by Bruno Martelli 11 Nov '21

11 Nov '21

Segnalo un programma di Master in geometria e topologia a Marsiglia, per l'anno prossimo (allegato). Può essere inoltrato a eventuali studenti interessati. Bruno

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Fwd: Postdoc at Sydney
by Bruno Martelli 05 Nov '21

05 Nov '21

Post-doc in geometric topology a Sidney ---------- Forwarded message --------- From: Stephan Tillmann <stephan.tillmann(a)sydney.edu.au> Date: Fri, Nov 5, 2021 at 3:45 AM Subject: Postdoc at Sydney To: tillus <stephan.tillmann(a)sydney.edu.au> Dear colleague, I'm advertising a 2-year research-only position in Geometry & Topology at the Sydney Mathematical Research Institute at the University of Sydney. Could you please pass this message on to any students or others who might be interested? The closing date for applications is 30 November 2021. Details can be found here: https://www.mathjobs.org/jobs/list/18709 Best regards, Stephan =============================================== Stephan 'Tillus' Tillmann Professor of Geometric Topology School of Mathematics and Statistics F07 The University of Sydney NSW 2006 Australia Deputy Director Australian Mathematical Sciences Institute The University of Melbourne, Australia e-mail: stephan.tillmann(a)sydney.edu.au web: http://www.maths.usyd.edu.au/u/tillmann phone: +61-2-9351-2005 ===============================================

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Fwd: ERC/MSCA Replacement Calls by SNSF
by Stefano Riolo 21 Oct '21

21 Oct '21

Borse post-doc (e altro) in Svizzera Saluti, Stefano -------- Messaggio Inoltrato -------- Due to the participation status of Switzerland as non-associated high-income third country in all 2021-calls for projects of the European Framework Programme for Research and Innovation “Horizon Europe”, Swiss research entities have been excluded from the /ERC Advanced Grants/2021 and the /MSCA European Fellowships 2021/which have now been replaced by two national transitional measures: /*SNSF Advanced Grants*/ The SNSF Advanced Grants <https://www.snf.ch/en/SSHTwon4N4v9R79P/funding/horizon-europe-advanced-gran…> are aimed at leading researchers who wish to conduct innovative, high-risk research in Switzerland. Proposals will be evaluated in two stages by panels of international experts, similar to the panels established for the ERC Advanced Grants Call opened: 1 October 2021 Mandatory pre-registration: 1 November 2021 Submission deadline: 1^December 2021 // /*SNSF Swiss Postdoctoral Fellowships*/ The Swiss Postdoctoral Fellowships <https://www.snf.ch/en/m1NtWp4nTELQixlu/funding/horizon-europe-swiss-postdoc…> (SPF) are research fellowships in all scientific domains with free choice of topic, addressed to researchers who have not resided or carried out their main activity (work, studies, etc.) in Switzerland for more than 12 months in the 36 months immediately prior to the submission deadline. Call opened: 15 October 2021 Mandatory pre-registration: 15 November 2021 Submission deadline: 15^December 2021 Please contact us <mailto:euresearch@unige.ch> for up-to-date information andadvice. Yours, Sincerely. Alex Waehry, Head European/international research support Manuela Motta, Research advisor in charge of ERC/SNSF-AdG Daniel Fuhrer, Research advisor in charge of MSCA/SNSF-SPF

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Seminario di Combinatoria, Teoria di Lie e Topologia - Michele D'Adderio - 21 Ottobre 2021
by Francesco Sala 19 Oct '21

19 Oct '21

Carə tuttə, Vi scrivo per annunciarvi che questo giovedì vi sarà un seminario in presenza per il ciclo di seminari "Seminario di Combinatoria, Teoria di Lie e Topologia” di Pisa. Il seminario si svolgerà in Aula Magna dalle 15 alle 16. L'oratore è Michele D'Adderio. — Titolo: Partial and global representations of finite groups Abstract: The notions of partial actions and partial representations have been extensively studied in several algebraic contexts in the last 25 years. In this talk, we introduce these concepts and give a short overview of the results known for finite groups. We will briefly show how this theory extends naturally to the classical global theory, in particular in the important case of the symmetric group. This is joint work with William Hautekiet, Paolo Saracco, and Joost Vercruysse. — (Qualora pensiate di venire, per aiutarmi nella stesura del documento di tracciamento, vi prego di iscrivervi qui) Vi prego di inoltrare questo messaggio a tutti coloro che ritenete possano essere interessati. Sperando di vedervi numerosi, vi mando i miei saluti, Francesco

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Seminario di geometria algebrica e aritmetica di Pisa, 13 ottobre
by Tamas Szamuely 12 Oct '21

12 Oct '21

Cari tutti, il seminario di geometria algebrica e aritmetica riprende in presenza! Prossimo seminario: Mercoledì 13 ottobre 2021, Dipartimento di matematica, Aula Magna 16:00--17:00 Gregory Pearlstein (Pisa): Archimedean height pairings for higher cycles By the work of Richard Hain, the archimedean height pairing on ordinary algebraic cycles can be interpreted as an invariant of an associated mixed Hodge structure. In this talk, we will present a similar construction for higher cycles in the Bloch complex. Families of higher cycles produce admissible variations of mixed Hodge structure. We will describe the asymptotic behavior of the height pairing in the case where the associated variation of mixed Hodge structure is Hodge-Tate. This is joint work with J. Burgos Gil and S. Goswami. Homepage del seminario: http://pagine.dm.unipi.it/tamas/saga.html Migliori saluti, Tamás Szamuely

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Fwd: Seminario di Combinatoria, Teoria di Lie e Topologia - Giovedì 7 Ottobre - 3 pm
by Bruno Martelli 05 Oct '21

05 Oct '21

Inoltro avviso su un seminario in dipartimento, domani alle 15. Bruno ---------- Forwarded message --------- From: Francesco Sala <francesco.sala(a)unipi.it> Date: Mon, Oct 4, 2021 at 10:51 PM Subject: Seminario di Combinatoria, Teoria di Lie e Topologia - Giovedì 7 Ottobre - 3 pm To: Carə tuttə, Vi scrivo per annunciarvi che questo giovedì riprenderà in presenza il ciclo di seminari "Seminario di Combinatoria, Teoria di Lie e Topologia” di Pisa. Il seminario si svolgerà in Aula Magna dalle 15 alle 16. La prima oratrice è Viola Siconolfi, appena giunta a Pisa. — Titolo: Ricci curvature, graphs and Coxeter groups Abstract: I will talk about a notion of curvature for graphs introduced by Schmuckenschläger which is defined as an analogue of Ricci curvature. This quantity can be computed explicitly for various graphs and allows to find bounds on the spectral gap of the graph and isoperimetric-type inequalities. I will present some general results on the computation of the discrete Ricci curvature of any locally finite graph. I will then focus on graphs associated with Coxeter groups: Bruhat graphs, weak order graphs and Hasse diagrams of the Bruhat order. — (Qualora pensiate di venire, per facilitarmi la stesura del documento di tracciamento, vi prego di iscrivervi qui <https://doodle.com/poll/hwuxn6a7p7sqdu4i?utm_source=poll&utm_medium=link>) Vi prego di inoltrare questo messaggio a tutti coloro che ritenete possano essere interessati. Sperando di vedervi numerosi, vi mando i miei saluti, Francesco

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Fwd: [Utenti] annuncio minicorso: "Combinatorial topology and group theory" / riunione preliminare
by Bruno Martelli 04 Oct '21

04 Oct '21

Segnalo minicorso in topologia presso il nostro dipartimento (on line) Bruno ---------- Forwarded message --------- From: Coordinatore del dottorato in matematica <coord_mat(a)dm.unipi.it> Date: Sat, Oct 2, 2021 at 9:14 PM Subject: [Utenti] annuncio minicorso: "Combinatorial topology and group theory" / riunione preliminare To: mailing list dottorandi <dottorandi(a)mail.dm.unipi.it>, utenti(a)dm.unipi.it <utenti(a)dm.unipi.it> Cc: Giovanni Paolini <paolini(a)caltech.edu> Buonasera, nel mese di novembre Giovanni Paolini (Caltech) terrà un mini-corso di 5 lezioni dal titolo Combinatorial topology and group theory (vedere sotto per maggiori dettagli). Il corso sarà tenuto online. La riunione preliminare sarà il 4 novembre 2021, ore 17 – 18, su Google Meet: https://meet.google.com/fgj-yduu-kpf Giovanni Alberti ============== Titolo: Combinatorial topology and group theory Abstract: In this course, we will cover combinatorial techniques to study topological spaces and groups. On the topological side, we are going to see how discrete Morse theory can be used to prove homotopical and homological statements through the language of partially ordered sets (posets). On the group-theoretic side, we are going to introduce Garside theory and apply it to the study of symmetric groups and braid groups (as well as their generalizations, Coxeter and Artin groups). Using discrete Morse theory, we will prove one of the main results of Garside theory, namely the construction of a classifying space (or K(π,1)) for an arbitrary Garside group. We will also mention algorithmic aspects in discrete Morse theory (related to collapsibility) and in Garside theory (the word problem). If time permits, we will also touch on current research directions in the theory of Garside groups, Coxeter groups, and Artin groups. Prerequisiti: Basic algebraic topology and homological algebra (e.g., the UniPi courses "Elementi di topologia algebrica" and "Istituzioni di algebra"). Emanuele Delucchi's course on "Combinatorial methods in topology" (Spring 2021) is not a requirement but will be useful. Programma provvisorio in 5 lezioni: 1. Partially ordered sets and relevant examples 2. Topological discrete Morse theory, applications and algorithms 3. Algebraic discrete Morse theory 4. Combinatorial Garside structures, the word problem, and examples (symmetric groups and braid groups) 5. Classifying spaces of Garside groups and consequences -- ________________________________________________________ Prof. Giovanni ALBERTI coordinatore del dottorato in Matematica Università di Pisa director of the graduate program in Mathematics University of Pisa e-mail: coord_mat(a)dm.unipi.it phone: +39 050 2213 239 virtual office: https://meet.google.com/rmt-jyke-iyw webpage: http://www.dm.unipi.it/webnew/dottorato/phd ________________________________________________________ _______________________________________________ Utenti mailing list Utenti(a)fields.dm.unipi.it https://fields.dm.unipi.it/listinfo/utenti

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Fwd: Assegno di ricerca in dinamica olomorfa e analisi complessa / Post-doc in holomorphic dynamics and complex analysis
by Bruno Martelli 13 Sep '21

13 Sep '21

Segnalo un assegno in dinamica olomorfa e analisi e geometria complessa, in una e più variabili, presso il nostro dipartimento (con preghiera di diffusione). Bruno ---------- Forwarded message --------- From: Marco Abate <marco.abate(a)unipi.it> Date: Sun, Sep 12, 2021 at 6:22 PM Subject: Assegno di ricerca in dinamica olomorfa e analisi complessa / Post-doc in holomorphic dynamics and complex analysis To: Marco Abate <marco.abate(a)unipi.it> [English version below] Con preghiera di diffusione a tutti gli interessati, e con scuse anticipate a chi riceve questo mail più volte. Presso il Dipartimento di Matematica dell’Università di Pisa è aperta una posizione di assegno di ricerca di un anno sul tema: *Dinamica olomorfa e analisi e geometria complessa, in una e più variabili* Il bando con le istruzioni per partecipare si trova qui https://alboufficiale.unipi.it/wp-content/uploads/2021/09/bando-Abate-1.pdf La scadenza per la presentazione delle domande è il *7 ottobre 2021 alle ore 13:00.* Per qualsiasi domanda sulla posizione o sulle modalità di partecipazione scrivete pure a me. Tutti gli interessati sono invitati a partecipare! ************ I would be grateful if you could pass this info to anyone interested, and I apologise in advance if you have received this mail more than once. There is an opening for a 1-year post-doc position at the Department of Mathematics of the University of Pisa on the following topic: *Holomorphic dynamics and complex analysis and geometry, in one and more variables* The instructions for applying can be found here: https://www.unipi.it/ateneo/bandi/assegni/2021/mat/7ott2021/inglese.pdf The deadline for the application is *October 7, 2021 at 1:00 PM.* For any question about the position or the application procedure feel free to e-mail me. Anybody interested is welcome to apply! Marco Abate ********************************************************** 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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Geometria_Pisa