学术报告（杨文元 12.15）

摘要：In this talk, we will introduce a class of groups acting on a proper metric space with contracting elements. This includes the actions of the fundamental groups of negatively-curved finite volume Riemannian manifolds on the universal covers, and of the mapping class groups on Teichmuller spaces among many others. We shall explain how  counting results and boundary measures are intertwined in various applications.