应数学与统计学院的邀请，北京大学孙文祥教授将于近期访问我院，期间将为师生做以下学术报告：

        时间：2015.12.4日上午10:00     
        地点：中2-2232   
       题目：Approximation Properties on Periodic Orbits and Atomic Measures in Non-uniformly Hyperbolic Systems

        摘要： 
        In non-uniformly hyperbolic systems, the basin of a hyperbolic measure can be approximated by periodic orbits, the measure itself  can be approximated by atomic measures supported on periodic orbits, and the Lyapunov exponents of the hyperbolic measure can be approximated by that of the atomic measures.Applications are presented for  these approximation properties.

        报告人简介： 
       孙文祥是北京大学数学科学学院教授，主要研究领域为动力系统，发表了一系列高水平的学术论文，与国内外同行有多项合作，并多次到国外讲学或合作研究。