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arXiv 1303.2299math.DS
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关于$Z_+^k$ -作用的熵

On an entropy of $Z_+^k$-actions

Yujun Zhu, Wenda Zhang

摘要:

本文给出了S.研究了Friedland \cite{Friedland}。与传统的定义不同,它可以为生成元具有有限(甚至为零)熵作为单个变换的动作取非零值。研究了扩张自同态生成的圆上的$\mathbb{Z}_+^k$ -作用的一些基本性质,并给出了它的值.此外,通过原像熵,这是依赖于系统的“逆轨道”结构的类熵不变量,通过扩展自同态生成的环面上的$\mathbb{Z}_+^k$ -作用的熵的上界得到。

英文摘要:

In this paper, a definition of entropy for $\mathbb{Z}_+^k(k\geq2)$-actions due to S. Friedland \cite{Friedland} is studied. Unlike the traditional definition, it may take a nonzero value for actions whose generators have finite (even zero) entropy as single transformations. Some basic properties are investigated and its value for the $\mathbb{Z}_+^k$-actions on circles generated by expanding endomorphisms is given. Moreover, an upper bound of this entropy for the $\mathbb{Z}_+^k$-actions on tori generated by expanding endomorphisms is obtained via the preimage entropies, which are entropy-like invariants depending on the "inverse orbits" structure of the system.

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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