On proximality with Banach density one |
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Authors: | Jian Li Siming Tu |
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Affiliation: | 1. Department of Mathematics, Shantou University, Shantou, Guangdong 515063, PR China;2. Wu Wen-Tsun Key Laboratory of Mathematics, USTC, Chinese Academy of Sciences and Department of Mathematics, University of Science and Technology of China, Hefei, Anhui, 230026, PR China |
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Abstract: | Let (X,T) be a topological dynamical system. A pair of points (x,y)∈X2 is called Banach proximal if for any ε>0, the set {n∈Z+:d(Tnx,Tny)<ε} has Banach density one. We study the structure of the Banach proximal relation. A useful tool is the notion of the support of a topological dynamical system. We show that a dynamical system is strongly proximal if and only if every pair in X2 is Banach proximal. A subset S of X is Banach scrambled if every two distinct points in S form a Banach proximal pair but not asymptotic. We construct a dynamical system with the whole space being a Banach scrambled set. Even though the Banach proximal relation of the full shift is of first category, it has a dense Mycielski invariant Banach scrambled set. We also show that for an interval map it is Li–Yorke chaotic if and only if it has a Cantor Banach scrambled set. |
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Keywords: | Banach density one Banach proximality Strongly proximal systems Scrambled sets |
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