摘  要：In this talk, some results on expansiveness and entropies of subsystems of Z^k (or Z₊^k)-actions are presented. Via the technique of random dynamical systems, the relation among entropy, preimage entropy and folding entropy of 1-dimensional subsystem of Z₊^k -actions is obtained. Moreover, the entropy of the natural extension of Z^k (or Z₊^k)-actions is also considered.

报告人简介：朱玉峻，厦门大学教授，从事动力系统领域的研究，研究内容涉及光滑动力系统的拓扑性质（包括稳定性和跟踪性等内容）和统计性质（包括熵、压和平衡态等内容）。主持国家自然科学基金多项，入选教育部新世纪优秀人才支持计划。在TRANS AMER MATH SOC，ERGODIC THEORY DYN SYST，J DIFFERENTIAL EQUATIONS，DISCRETE CONTIN DYN STST等学术期刊上发表论文30余篇。

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