91直播

91直播：刘凯冉（中国科技大学）

时间：2021年3月25日 9:30开始

地点：数统91直播 LD302

报告摘要：In this talk, by applying some recent results about recurrence and multiple ergodic average, we introduce  two kinds of chaos of dynamical systems with positive entropy. We will prove that, for countable torsion-free discrete group actions positive entropy implies the existence of $\Delta$-weakly mixing sets. We will also introduce $\Delta$-weakly mixing sets along a collection of sequences of integers for $\mathbb{Z}$-actions. Finally, we consider the mean Li-Yorke chaos along non-constant integer polynomials for a dynamical system.Part of the work is joint with Li Jian.

联系人：黄辉斥

欢迎广大师生积极参与！