Past Events

In many applications one wishes to minimize an objective function that is not convex and is not differentiable at its minimizers. We discuss two algorithms for minimization of nonsmooth, nonconvex functions. Gradient Sampling is a simple method that...

Over $Q$ there do not exist any non-zero abelian varieties with good reduction everywhere. However, over all but six real quadratic fields they actually do exist. In this talk we determine, for certain small real quadratic fields $F$, the set of...

This is joint work with Frederic Naud (Avignon). After reviewing general results about resonances on (asymptotically) hyperbolic manifolds, we discuss some recent results on the distribution of resonances for infinite index congruence subgroups of SL...

The talk will be divided into 2 parts. First, we will theoretically justify the applicability of compressed sensing (CS) in real-life applications. To do so, I will introduce CS theorems compatible with physical acquisition constraints. These new...

I will talk about the problem of studying the reduction modulo p of crystalline representations of dimension 2 of the Galois group of Q_p. In particular, I will be interested in the following situation: fix Hodge-Tate weights and a residual...

Stability of classical mechanical systems is very old problem, still very much under scrutiny nowadays. Some techniques can be applied transversally in different problems. *** Cédric Villani is the Director of the Institut Henri Poincaré, France’s...

Cédric Villani is the Director of the Institut Henri Poincaré, France’s prime and oldest international institute for research in mathematical sciences.He has received many mathematical awards, including the Fields Medal in 2010, often considered the...

The surprising encounter of three fields of research, namely non-Euclidean geometry, statistical physics and mathematical economy, and a reflection on the human drivers behind mathematical research.

Next year brings the 100th anniversary of Watson's classic paper "The diffraction of electric waves by the earth" and I would like to use this as a welcome excuse to review various results about scattering by spherical obstacles. Is the sphere...