Regionally proximal relation of order d is an equivalence one for minimal systems and a combinatorial consequence

Regionally proximal relation of order d is an equivalence one for minimal systems and a combinatorial consequence
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d 阶区域邻近关系是最小系统的等价关系和组合结果

DOI:
10.1016/j.aim.2012.07.012
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发表时间:
2010-07
影响因子:
1.7
通讯作者:
Ye, Xiangdong
Ye, Xiangdong
中科院分区:
数学1区
文献类型:
--
作者:
Shao, Song;Ye, Xiangdong

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Host,Kra和Maass最近刻画了拓扑动力系统中零系的逆极限.即,对每个d∈N,引入了区域邻近关系的某种推广,并证明了对于远端极小系统,这种关系是一个等价关系,它决定了最大d步零因子.本文的主要结果之一是证明了上述结果对一般极小系统也成立。本文还导出了一个组合推论,它是Host和Kra关于正的上Banach密度子集的遍历方法的结果的拓扑对应。
Inverse limits of nilsystems in topologically dynamical systems were characterized by Host, Kra and Maass recently. Namely, for each d∈N a certain generalization of the regionally proximal relation was introduced, and for a distal minimal system it was shown that such a relation is an equivalence one, which determines the maximal d-step nilfactor. One of the main results in this article is to show that the above results hold for a general minimal system. A combinatorial consequence is also deduced, which is the topological correspondence of the result obtained by Host and Kra for positive upper Banach density subsets using ergodic methods.
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