On local aspects of topological weak mixing in dimension one and beyond

On local aspects of topological weak mixing in dimension one and beyond
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一维及更高维拓扑弱混合的局部方面

DOI:
10.4064/sm202-3-4
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发表时间:
2011
期刊:
影响因子:
0.8
通讯作者:
Oprocha, Piotr
Oprocha, Piotr
中科院分区:
数学3区
文献类型:
--
作者:
Zhang, Guohua;Oprocha, Piotr

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我们引入了弱混合集的概念,并表明,在弱混合的映射,弱混合集的顺序n不一定是弱混合的顺序n + 1。严格地说,我们构造了一个最小可逆动力系统,它包含一个非平凡的弱混合集的顺序2,而它不包含任何非平凡的弱混合集的顺序3。在一维中,这种差异并不明显,因为我们证明了从拓扑图到自身的每个连续映射f都有正拓扑熵当且仅当它包含一个2阶非平凡弱混合集当且仅当它包含一个所有阶的非平凡弱混合集。
We introduce the concept of weakly mixing sets of order n and show that, in contrast to weak mixing of maps, a weakly mixing set of order n does not have to be weakly mixing of order n + 1. Strictly speaking, we construct a minimal invertible dynamical system which contains a non-trivial weakly mixing set of order 2, whereas it does not contain any non-trivial weakly mixing set of order 3. In dimension one this difference is not that much visible, since we prove that every continuous map f from a topological graph into itself has positive topological entropy if and only if it contains a non-trivial weakly mixing set of order 2 if and only if it contains a non-trivial weakly mixing set of all orders.
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