« Joshua Frisch, raconte-moi la moyennabilité forte ! »
En hybride 45 rue d'Ulm, ParisA topological dynamical system (i.e. a group acting by homeomorphisms on a compact metric space) is said to be proximal if for any two points p and q we can simultaneously "squish them together". A group is strongly amenable if every proximal dynamical system has a fixed point. In this talk I will give an introduction to proximal actions, strong amenability and discuss connections with other group theoretic properties. No prior knowledge of topological dynamics or amenability will be assumed. En salle W au DMA, ou sur Zoom (réunion 997 […]