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Sequence entropy and independence in free and minimal actions

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arxiv 2504.00960 v2 pith:N65VY2MP submitted 2025-04-01 math.DS

classification math.DS
keywords mathbbminimalentropyeveryindependencesequenceactionactions
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abstract

For every countable infinite group that admits $\mathbb{Z}$ as a homomorphic image, we show that for each $m\in\mathbb{N}$, there exists a minimal action whose topological sequence entropy is $\log(m)$. Furthermore, for every countable infinite group $G$ that contains a finite index normal subgroup $G'$ isomorphic to $\mathbb{Z}^r$, and for every $m\in \mathbb{N}$, we found a free minimal action with topological sequence entropy $\log(n)$, where $m\leq n\leq m^{2^r[G:G']}$. In both cases, we also show that the aforementioned minimal actions admit non-trivial independence tuples of size $n$ but do not admit non-trivial independence tuples of size $n+1$ for some $n\geq m$.

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  1. Independence and mean sensitivity in minimal systems under group actions

    math.DS 2025-01 accept novelty 8.0 of 10

    For broad classes of minimal group actions, almost every fiber of the maximal equicontinuous factor is an IT-set, which resolves two conjectures and links mean sensitivity to independence.

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