buondì, con colpevole ritardo vi segnalo il seminario di geometria di domani. Siete tutti invitati. a presto, Bruno ----- 22-Mar-2017 - 15:00 Sala Seminari (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/sala-seminari-dip-matematica> Entropy and length rigidity of negatively curved manifolds of finite volume <http://www.dm.unipi.it/webnew/it/seminari/entropy-and-length-rigidity-negatively-curved-manifolds-finite-volume> Andrea Sambusetti The problems of conjugacy rigidity and of entropy rigidity have a long history, with major breakthroughs in the last twenty years, for negatively curved compact manifolds and symmetric spaces. On the other hand, little is known for finite volume manifolds. I will survey the state of the art of these problems, and explain what can be generalized to finite volume manifolds, pointing out the main difficulties that arise in the non-compact case.