We give counterexamples to a conjecture of Bowditch that if a non-elementary type-preserving representation ρ : π1(Σg,n) → P SL(2; R) of a punctured surface group sends every non-peripheral simple closed curve to a hyperbolic element, then ρ must be…
Categoria evento: Seminars
Crouzeix Conjecture – Michael L. Overton (Courant Institute of Mathematical Sciences, New York University)
Crouzeix’s conjecture is among the most intriguing developments in matrix theory in recent years. Made in 2004 by Michel Crouzeix, it postulates that, for any polynomial p and any matrix A, ||p(A)|| <= 2 max(|p(z)|: z in W(A)), where the norm is the…
Crystalline fundamental group and Berthelot’s conjecture for isocrystals – Fabio Tonini (Università di Firenze)
In the talk I will introduce the crystalline site of a variety in positive characteristic, discuss the notion of crystals and isocrystals over it and define its crystalline fundamental group. I will then discuss Berthelot’s conjecture and its…
The universal affine extension of an abelian variety – Michel Brion (Université Grenoble Alpes)
Every abelian variety $A$ over a field $k$ admits a universal extension by an affine $k$-group scheme. The talk will present a construction of this universal affine extension (first due to Serre when $k$ is algebraically closed of characteristic…
Continuum limit of a hard-sphere particle system by large deviations – Mark Peletier (Eindhoven University of Technology)
Many stochastic particle systems have well-defined continuum limits: as the number of particles tends to infinity, the density of particles converges to a deterministic limit that satisfies a partial differential equation. In this talk I will…
On the trace of Sobolev spaces on the Von Koch’s snowflake – Michal Wojciechowski (Mathematical Institute of the Polish Academy of Science)
We show that the boundary trace operator on Sobolev space of functions with summable gradient on von Koch’s snowflake has a right inverse. This contrasts with the case of domains with nice boundaries in which, according to Petree’s theorem, a right…
Che cos’è una infinito-categoria – Guglielmo Nocera (SNS di Pisa)
Titolo:Che cos’è una-categoria Prerequisiti: familiarità con la nozione di categoria e di spazio topologico, definizione di omotopia Abstract: \t\t\tOr, come ai colpi de li caldi rai \t\t\tde la neve riman nudo il suggetto \t\t\te dal colore e dal…
Il matematico in banca – Davide Di Giorgio (Credito Emiliano S.p.A.)
Come “investire” in Banca la propria laurea in matematica. Esempi di possibili lavori, punti di forza e debolezza, dove sono…
Il complesso delle curve e la Metacongettura di Ivanov – Marco Barberis (University of Warwick)
Titolo:Il complesso delle curve e la Metacongettura di Ivanov Abstract:Nello studio delle superfici, ed in particolare dei loro omeomorfismi, ha assunto un ruolo centrale, a partire dalla sua introduzione nel 1978, il complesso delle curve. Questo…
Linear stability of a shock profile for a quasilinear Benney system in R – Joao Paulo Dias (Lisbon)
Venue Sala Riunioni (Dip. Matematica). Abstract…