Gérard Besson (Grenoble) will speak in the geometr seminar at 1.30pm on 18th March **(note the unusual time!)** in the Salle des Profs (9th floor of building NO). Gérard’s title is “Finiteness Theorems for Gromov-Hyperbolic Groups” and his abstract is below.

*This is a joint work with G. Courtois, S. Gallot and A. Sambusetti. We shall prove that, given two positive numbers delta and H, there are finitely non cyclic torsion-free delta-hyperbolic marked groups (Gamma , Sigma) satisfying *Ent*(Gamma, Sigma) <= H, up to isometry (of marked groups). Here a marked group is a group Gamma together with a symmetric generating set Sigma and *Ent *is the entropy of the marked group. *

*The talk is intended to be elementary; the purpose is to define all these notions and give a flavour of the proof*