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Topological mild mixing of all orders along polynomials

  • *Corresponding author: Song Shao

    *Corresponding author: Song Shao

This research is supported by NNSF of China (11971455, 11571335)

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  • A minimal system $ (X,T) $ is topologically mildly mixing if for all non-empty open subsets $ U,V $, $ \{n\in {\mathbb Z}: U\cap T^{-n}V\neq \emptyset\} $ is an IP$ ^* $-set. In this paper we show that if a minimal system is topologically mildly mixing, then it is mild mixing of all orders along polynomials. That is, suppose that $ (X,T) $ is a topologically mildly mixing minimal system, $ d\in {\mathbb N} $, $ p_1(n),\ldots, p_d(n) $ are integral polynomials with no $ p_i $ and no $ p_i-p_j $ constant, $ 1\le i\neq j\le d $. Then for all non-empty open subsets $ U , V_1, \ldots, V_d $, $ \{n\in {\mathbb Z}: U\cap T^{-p_1(n) }V_1\cap T^{-p_2(n)}V_2\cap \ldots \cap T^{-p_d(n) }V_d \neq \emptyset \} $ is an IP$ ^* $-set. We also give the corresponding theorem for systems under abelian group actions.

    Mathematics Subject Classification: Primary: 37B20; Secondary: 37B05, 37A25.


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