北京赛车pk拾开奖直播-北京赛车pk拾开奖结果记录-Welcome热购

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发布者涝芦:文明办发布时间捣夸:2019-04-12浏览次数残咀巫:78


主讲人冒乌:史逸 北京大学 研究员


时间试:2019年4月15日11崇罢:15


地点痉残栖:徐汇校区三号楼332


举办单位堕稍:数理学院


内容介绍惯扰窝:The Cr-closing lemma is one well-known problem in the theory of dynamical  systems. The problem is to perturb the original dynamical system so as to obtain  a Cr-close system that has a periodic orbit passing through a given point. And  this point is called Cr-closable. In this talk, we prove the Cr-closing lemma (r  = 2,3,···,∞) for partially hyperbolic diffeomorphisms on 3-manifolds: every  non-wandering point of these diffeomorphisms is Cr-closable. Moreover, we will  show that Cr-generic conservative partially hyperbolic diffeomorphisms on  3-manifolds have dense periodic points.This is a joint work with Shaobo Gan.

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