Geometria_Pisa

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seminario domani
by Bruno Martelli 07 Apr '15

07 Apr '15

buondì, vi annuncio il seminario di geometria di domani, al quale siete tutti invitati. a presto, Bruno ---- Wednesday, April 8, 2015 Ora Inizio: 16:00 Aula: Sala Seminari (Dip. Matematica) SEMINARI DI GEOMETRIA Relatore: Antonio De Capua (University of Oxford) Titolo: Hyperbolic volume of links, via pants graphs and train tracks Abstract: A result of Jeffrey Brock states that, given a hyperbolic 3-manifold which is a mapping torus over a surface S, its volume can be expressed in terms of the distance induced by the monodromy map in the pants graph of S. This is an abstract graph whose vertices are pants decompositions of S, and edges correspond to some sort of 'elementary alterations' of those. Brock's theorem motivates investigation about distances in the pants graph; in particular we generalise a result of Masur, Mosher and Schleimer that train track splitting sequences (which will be defined during the talk) induce quasi-geodesics in the marking graph. This will be the core piece of a volume estimate for complements of closed braids in the solid torus.

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summer school "Cohomology and Large Scale Geometry"
by Roberto Frigerio 01 Apr '15

01 Apr '15

Buongiorno, vi segnalo la scuola estiva di cui nel subject, che si terra' a Regensburg dal 27 al 31 luglio. Qui potete trovarne una descrizione: http://clsg.sfb-higher-invariants.de Saluti, Roberto

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assegno di ricerca
by Bruno Martelli 20 Mar '15

20 Mar '15

Segnalo un assegno di ricerca dal PRIN di De Concini: http://www2.mat.uniroma1.it/node/5824 Bruno

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seminario oggi
by Bruno Martelli 18 Mar '15

18 Mar '15

puntualmente in ritardo, vi annuncio il seminario di geometria di oggi. a presto, Bruno ---- Wednesday, March 18, 2015 Ora Inizio: 16:00 Aula: Sala Seminari (Dip. Matematica) SEMINARI DI GEOMETRIA Viveca Erlandsson (Aalto University) Counting self-intersecting multicurves Abstract: I will describe some joint work in progress with Juan Souto studying the asymptotic growth on the number $n_k^S(L)$ of multicurves with $k$ self-intersections of length at most $L$ on a hyperbolic surface $S$. More concretely, I will show that for small $k$, $\frac{n_k^S(L)}{L^{6g-6}}$ has a limit as $L\to\infty$. Moreover, when $S$ is the punctured torus, this limit exists for any fixed $k$.

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A Complex Geometry Day in Pisa
by Daniele Angella 16 Mar '15

16 Mar '15

Dear all, we are happy to announce a 1-day meeting on Complex Geometry that will be held on Friday May 15th, 2015 at Centro di Ricerca Matematica "Ennio de Giorgi" in Pisa. The workshop consists in seminars by young researchers on Kähler and non-Kähler geometry and related topics, with the aim to share recent results and start new collaborations. Invited speakers include: - Giovanni Bazzoni (Universität Bielefeld); - Andrea Cattaneo (Università di Parma); - Eleonora Di Nezza (Imperial College London); - Riccardo Lena (Università di Parma); - Giulia Sarfatti (Università di Bologna); - Pietro Tortella. Anyone interested in the programme is welcome. A registration form, and more and updated informations, are available at the website: http://crm.sns.it/event/350/ . See also http://gecogedi.dimai.unifi.it/event/139/ . The event is supported by Centro di Ricerca Matematica "Ennio de Giorgi" and by Scuola Normale Superiore, as part of the SNS GR project "Geometry of non-Kähler manifolds". You are welcome to contact the organizers: - Daniele Angella - daniele.angella(a)gmail.com - Simone Calamai - simocala(a)gmail.com - Michela Zedda - michela.zedda(a)gmail.com

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seminario oggi
by Bruno Martelli 11 Mar '15

11 Mar '15

Con colpevole ritardo vi annuncio il seminario di geometria di oggi, sempre alle 16 in aula seminari. Bruno Wednesday, March 11, 2015, 16:00 - 17:00 SEMINARI DI GEOMETRIA Sala Seminari (Dip. Matematica) Sums of powers in algebraic function fields of one variable over R Eberhard Becker (professore emerito dell'Universita` di Dortmund)

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[GeCo GeDi seminar] Topological Quantum Field Theories
by daniele.angella＠gmail.com 09 Mar '15

09 Mar '15

Topological Quantum Field Theories ----------------------------------------- http://gecogedi.dimai.unifi.it/seminar/194/ Date: Wednesday, Mar 11, 2015 Time: 18:00 Place: Sala Seminari, Dipartimento di matematica, Pisa Speaker: Carlo Collari Seminari dei Baby-Geometri Abstract. Topological Quantum Field Theories (TQFTs for short) were axiomatized by Atiyah in 1988 ([1]). Following his exposition, we will define the concept of TQFT and give some examples. In particular, we will describe the (1+1)-TQFTs and their algebraic counterparts, the Frobenius algebras. Time permitting we will give some more examples in higher dimension. [1] M. Atiyah, /Topological Quantum Field Theory/, Publications Mathématiques de l'IHÉS 68 (68): 175–186

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Seminario oggi
by Roberto Frigerio 04 Mar '15

04 Mar '15

Cari tutti, vi ricordo che oggi pomeriggio alle ore 16 in aula seminari Clara Loeh (Universita' di REgensburg) terra' un seminario dal titolo "The l^infinity seminorm on uniformly finite homology". Saluti, Roberto Frigerio

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seminario Sauer annullato
by Bruno Martelli 23 Feb '15

23 Feb '15

buondì, il seminario previsto per mercoledì alle 16 di Roman Sauer è cancellato e rimandato al 27 maggio. a presto, Bruno

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seminario domani
by Bruno Martelli 17 Feb '15

17 Feb '15

buondì, vi segnalo il seminario di geometria di domani, sempre alle 16 in aula seminari. a presto, Bruno ------- SEMINARI DI GEOMETRIA Wednesday, February 18, 2015 Ora Inizio: 16:00 Aula: Sala Seminari (Dip. Matematica) Relatrice: Cristina Pagliantini (Regensburg) Titolo: Quasimorfismi e coomologia limitata Abstract: Nel seminario presenteremo la relazione tra coomologia limitata e quasimorfismi di un gruppo. Ci concentreremo poi sui quasimorfisimi mediani e daremo una caratterizzazione delle azioni su alberi che inducono quasimorfismi mediani non banali.

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