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arXiv 2005.12856math.DS
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无限乘积空间任意子集的拓扑熵

Topological Entropy for Arbitrary Subsets of Infinite Product Spaces

Maysam Maysami Sadr, Mina Shahrestani

AI总结:

本文定义无限乘积空间任意子集的广义拓扑熵及广义 Bowen 熵,证明其与连续映射经典熵的一致性,并给出分形内在熵等性质。

摘要:

在本短文中,我们引入了一种广义拓扑熵的概念,适用于紧拓扑空间中全体序列所成空间的任意子集。我们证明,对于紧空间上的连续映射,该映射所有轨道之集的广义拓扑熵与该映射的经典拓扑熵一致。文中考察了这一新熵概念的若干基本性质,其中包括:熵关于不交并、笛卡尔积、分量限制与扩张、移位映射的行为,以及关于 Vietoris 拓扑的一些连续性性质。作为示例,我们证明,由有限族压缩映射给出的分形的任何自相似结构,都会产生该分形子集的一种内在拓扑熵概念。我们还引入了与拓扑空间上任意递增的相容半度量序列相关联的广义 Bowen 熵概念,并考察了其若干基本性质。作为特例,对于 $1\leq p\leq\infty$,我们引入了任意度量空间的序列集合的 Bowen $p$-熵。结果表明,对于紧度量空间,广义拓扑熵与 Bowen $\infty$-熵这两个概念是一致的。

英文摘要:

In this note a notion of generalized topological entropy for arbitrary subsets of the space of all sequences in a compact topological space is introduced. It is shown that for a continuous map on a compact space the generalized topological entropy of the set of all orbits of the map coincides with the classical topological entropy of the map. Some basic properties of this new notion of entropy are considered; among them are: the behavior of the entropy with respect to disjoint union, cartesian product, component restriction and dilation, shift mapping, and some continuity properties with respect to Vietoris topology. As an example, it is shown that any self-similar structure of a fractal given by a finite family of contractions gives rise to a notion of intrinsic topological entropy for subsets of the fractal. A generalized notion of Bowen's entropy associated to any increasing sequence of compatible semimetrics on a topological space is introduced and some of its basic properties are considered. As a special case for $1\leq p\leq\infty$ the Bowen $p$-entropy of sets of sequences of any metric space is introduced. It is shown that the notions of generalized topological entropy and Bowen $\infty$-entropy for compact metric spaces coincide.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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