- Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

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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assegni a Bologna
by Bruno Martelli 01 Sep '21

01 Sep '21

Buondì, Segnalo un bando per due assegni di ricerca a Bologna in tutti i settori, qui: https://bandi.unibo.it/ricerca/assegni-ricerca?id_bando=54523 A presto, Bruno Martelli

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RTDA in geometria a Pisa
by Bruno Martelli 06 Aug '21

06 Aug '21

Cari colleghi, Segnalo che è uscito il bando per un posto da RTDA in geometria al Dipartimento di Matematica dell'Università di Pisa. La scadenza per presentare domanda è: ore 13:00 del 30 agosto. Questo il link: https://www.unipi.it/ateneo/bandi/ricercat/ricercator/Procedura-1/index.htm Vi invito a diffondere la notizia a tutti i potenziali interessati. ---- Dear colleague, A position as a Junior Research Fellow (Ricercatore a Tempo Determinato di Tipo A) at the Department of Mathematics of the University of Pisa is now open. The position is in the area of Geometry, considered in a broad sense, including algebraic, differential, complex analytic geometry, topology, dynamical systems, etc: you may find the description of the research directions of the geometry group at http://www.dm.unipi.it/webnew/en/ricerca/geometry-mat03 The deadline to apply is August 30, 2021, at 1 pm. This position lasts 3 years. The teaching load is around 60 hours/year. Please forward this information to any potential candidate.

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Fwd: Job Vacancy - 1 year postdoctoral fellowships (Neuchatel, Switzerland)
by Stefano Riolo 23 Jul '21

23 Jul '21

2 posizioni post-doc di un anno in geometria iperbolica a Neuchâtel (Svizzera) Saluti, Stefano -------- Messaggio Inoltrato -------- Oggetto: Job Vacancy - 1 year postdoctoral fellowships (Neuchatel, Switzerland) Data: Thu, 22 Jul 2021 17:52:47 +0200 Mittente: Alexander Kolpakov <kolpakov.alexander(a)gmail.com> A: Alexander Kolpakov <kolpakov.alexander(a)gmail.com> Dear Colleague, Please disseminate within your department. Cheers, Sasha ----------------------- *Job vacancy / Offre d'emploi* *Contact: *Dr. Alexander Kolpakov, Université de Neuchâtel* * *e-mail: *kolpakov.alexander(a)gmail.com <mailto:kolpakov.alexander@gmail.com> *www: *https://sashakolpakov.wordpress.com/ <https://sashakolpakov.wordpress.com/> ----------------------- Within the framework of the Swiss National Science Foundation project ``Higher-dimensional geometric and combinatorial structures'' *two Postdoctoral Fellowships are available*. The earliest possible start is *September, 2021*. Each position has a duration of *one year *(and cannot be renewed). All candidates must hold a PhD degree or an equivalent. The candidates will concentrate their research in the areas of *hyperbolic geometric, geometric topology, group theory, and their applications* (e.g. to problems in convex and polyhedral geometry, combinatorics, data science). These positions carry a competitive salary of approximately *89'000 CHF per annum* (gross income). There is *no teaching load*: both positions are research-only. The application should include a complete *curriculum vitae* and a succinct *statement of purpose* explaining candidate's academic background, achievements to date and research interests within the project. Please *include the names and e-mail addresses of no more than two reference writers*. Your reference writers will be contacted at a later point in time, if necessary. There is no need to arrange for any reference letters to be sent in advance. Preferably all applications *should be sent by e-mail* in order to receive timely consideration. *Please bind your application package as a single .pdf file.* Only selected candidates will be contacted. ------------------------------------------

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Fwd: [Geometriaglobale] Quinto assegno di ricerca Prof. Paolo de Bartolomeis
by Bruno Martelli 05 Jul '21

05 Jul '21

---------- Forwarded message --------- From: Daniele Angella <daniele.angella(a)unifi.it> Date: Mon, Jul 5, 2021 at 3:41 PM Subject: Fwd: [Geometriaglobale] Quinto assegno di ricerca Prof. Paolo de Bartolomeis To: (Dear all, please forward this announcement to potential candidates: thanks in advance!) ---------- Forwarded message --------- From: Fiammetta Battaglia <fiammetta.battaglia(a)unifi.it> Date: Mon, Jul 5, 2021 at 3:25 PM Subject: [Geometriaglobale] Quinto assegno di ricerca Prof. Paolo de Bartolomeis To: Dimai News <dimai-news(a)lists.math.unifi.it>, <geometria(a)lists.math.unifi.it>, <geometriaglobale(a)lists.math.unifi.it>, Antonella Nannicini <antonella.nannicini(a)unifi.it> Care, cari, è stato pubblicato il bando del quinto assegno di ricerca in memoria di Paolo de Bartolomeis, vi preghiamo di darne diffusione: Postdoctoral position in memory of Paolo de Bartolomeis Deadline: 05 oct 2021 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, 05, 2021. 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%2F004116718-UNFICLE-6281149… For those who do not speak Italian, here below you can find information on the application procedure, in English: https://drive.google.com/file/d/1jvThE3QL6GB80YWTIh8ZMKZxffMZhenB/view?usp=… 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 daniele.angella(a)unifi.it Un caro saluto, Fiammetta Battaglia e Antonella Nannicini _______________________________________________ Geometriaglobale mailing list Geometriaglobale(a)lists.math.unifi.it https://lists.math.unifi.it/mailman/listinfo/geometriaglobale

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Fwd: Seminario informale di topologia mercoledì alle 11
by Bruno Martelli 15 Jun '21

15 Jun '21

Buonasera, Il seminario di domani alle 11 è confermato e c'è posto per tutti quelli che mi hanno fatto richiesta. Sarà anche trasmesso su google meet a questo indirizzo: https://meet.google.com/xsu-ubdz-grm (a meno ovviamente di inconvenienti tecnici) A domani, Bruno ---------- Forwarded message --------- From: Bruno Martelli <bruno.martelli(a)unipi.it> Date: Fri, Jun 11, 2021 at 5:02 PM Subject: [Geometria_pisa] Seminario informale di topologia mercoledì alle 11 To: Geometria <Geometria_Pisa(a)mail.dm.unipi.it> Buongiorno, Mercoledì prossimo alle 11 in Aula Magna Ludovico Battista terrà un seminario informale in cui ci spiegherà come sia possibile dimostrare la rigidità di varietà iperboliche di volume infinito in dimensione 4 a 5 abbastanza complesse. In Aula Magna ci sono massimo 25 posti e confido che siano sufficienti, chiedo però alle persone interessate di comunicarmi la loro presenza entro lunedì sera (anche perché vorrei usare l'aula lo stesso giorno anche per fare esami). Se qualcuno vuole seguire on-line basta che mi scriva (entro martedì) e ci adoperiamo con l'attrezzatura. Seguono titolo e abstract. A presto, Bruno ---- Titolo: Infinitesimal Deformations of Hyperbolic Manifolds Abstract: in the last two years, the refinement of a tool due to Jankiewicz - Norin - Wise based on Betsvina - Brady theory led to important results. This work culminated with the amazing example of Italiano - Martelli - Migliorini of a Hyperbolic 5-Manifold M which fibers over S^1. The importance of the existence of such a manifold appears to go far beyond the world of Hyperbolic Manifolds. One interesting aspect of this family of examples is that they can be manipulated combinatorially. This allows us to study the dimension of infinitesimal deformations of the hyperbolic structure of the cover M̃ associated to the map M -> S^1. The complexity of the task, though, required the exploitation of a series of methods to overcome the computational problems. In particular, we will talk about the Groupoid associated with a cube complex and how we used it to obtain the rigidity of M̃.

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