buondì,

con colpevole ritardo vi segnalo il seminario di geometria di domani. Siete tutti invitati.
  a presto,
      Bruno

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22-Mar-2017 15:00
Entropy and length rigidity of negatively curved manifolds of 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.