June 2021 - Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

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

11 Jun '21

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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Conferenza Swiss Knots
by Bruno Martelli 07 Jun '21

07 Jun '21

Dal vivo, dal 6 al 9 luglio, questo il link: https://homeweb.unifr.ch/liechtli/pub/swissknots21/index.html

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Fwd: [gdrtresses] Braids and beyond / Tresses et perspectives, Conference in memory of Patrick Dehornoy
by Bruno Martelli 04 Jun '21

04 Jun '21

---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Fri, Jun 4, 2021 at 5:05 PM Subject: [gdrtresses] Braids and beyond / Tresses et perspectives, Conference in memory of Patrick Dehornoy To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> ********************************** Dear colleagues, The meeting "Braids and beyond / Tresses et perspectives, Conference in memory of Patrick Dehornoy" that was planned for last September will now take place from the 8th to the 10th of September 2021 at the University of Caen. It will be hybrid, and participants will be able to attend the meeting online. Depending on the situation with the pandemic at the time of the meeting, it should also be possible for some participants to take part in person, within the limit on the number of places imposed by our university. If you wish to attend the meeting, either virtually or online, please fill in the registration form on the website of the meeting: https://conf.lmno.cnrs.fr/Braids2020/index.html To avoid confusion, we will start the registration process from scratch. In particular, if you registered for the meeting last year and wish to attend, please re-register. The list of speakers may also be found on the website. Please feel free to circulate this message to anyone who may be interested. For all inquiries, the contact address is: lmno.braids2020 at unicaen.fr. Best wishes, the Organising Committee (Paolo Bellingeri, Eddy Godelle, John Guaschi, Victoria Lebed, Bernard Leclerc, Gilbert Levitt, Friedrich Wehrung). **********************************

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Conferenza a Ventotene - settembre 2021
by Bruno Martelli 01 Jun '21

01 Jun '21

Buondì, Magno gaudio nuntio vobis che la consueta biennale conferenza a Ventotene è confermata anche per quest'anno. Questa è la home page: https://www.ventoteneinternationalworkshops.net/ <https://www.ventoteneinternationalworkshops.net/> Counting problems - Ventotene International Workshops <https://www.ventoteneinternationalworkshops.net/> www.ventoteneinternationalworkshops.net

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