Nd 上某些族的动力学性质

Dynamical Property of Family on Nd

  • 摘要: 一个正整数集 \mathbbN 的子集 S 称作是一个强迫回归集, 若对于任何一个动力系统 (X, f) 及 X 的任何一个紧致子集 K, 只要 X 中有一点 x 满足 \f^nx | n\in S\ \subseteq K,则 K 中必含有 f 的某个回归点. 该文对 \mathbbN^d~(d\in\mathbbN) 的子集引入回归时间集的概念, 讨论了由回归时间集所构成的族的几个特征, 并且给出了它们的一个简单应用.

     

    Abstract: Blohk and Fieldsteel introduced firstly the concept of set forcing recurrence in 2002. A subset S of the set of positive integers N is called a set forcing recurrence, if for any dynamical system (X, f) and any compact set K  X, whenever there exists x 2 X such that fnx|n 2 S  K, then K must contain some recurrence points of f. In this paper, the definition of set of recurrence times of Nd (d 2 N) is introduced, and several characters of the families of sets of recurrence times are obtained. Furthermore, an application of the sets of recurrence times is provided.

     

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