资讯中心
 
 您所在的位置:首页
 >>  资讯中心  >>  学术报告
学术报告 Working Seminar in Dynamical Systems: Research on Points without Lyapunov exponents
报  告  人:田学廷 教授 (复旦大学)
时        间:2020年6月16日(周二) 上午 9:30-10:30
地        点:腾讯会议号: 985 750 077
主办单位:应用数学系
联系人:吴伟胜
联系方式:

摘  要:It follows from Oseledec Multiplicative Ergodic Theorem (or Kingman’s sub-additive Ergodic Theorem) that the set of ‘non-typical’ points for which the Oseledec averages of a given continuous cocycle diverge has zero measure with respect to any invariant probability measure. In strong contrast, for any H¨older continuous cocycles over hyperbolic systems, in this talk we show that either all ergodic measures have same Maximal Lyapunov exponents or the set of Lyapunov ‘non-typical’ points is a dense $G_delta$ subset and carries full topological entropy and packing topological entropy. Moreover, we give an estimate of Bowen Hausdorff entropy from below by the metric entropy of ergodic measures which are not Lyapunov minimizing, and if further the function of integrable Lyapunov exponent is lower semi-continuous with respect to invariant measures, the set of Lyapunov ‘non-typical’ points carries full Bowen Hausdorff entropy.


报告人简介:

田学廷,复旦大学数学科学学院教授,博士生导师。主要研究领域:动力系统与遍历论。已在《 Adv. Math. 》、 《 Trans. AMS 》、《 Erg. The. & Dyn. Sys. 》、《 Math. Z. 》、《 Ann I H Poincare-Prob.Stat. 》、《 Journal of Differential Equations 》、《 Nonlinearity 》等杂志上发表20余篇学术论文。


欢迎各位老师同学参加!


 
  学院新闻   
  学院公告   
  媒体理院   
  学术报告