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AN ALGEBRAIC APPROACH TO ENTROPY PLATEAUS IN NON-INTEGER BASE EXPANSIONS

机译:非整数基扩展中熵极板的一种代数方法

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摘要

For a positive integer M and a real base q is an element of (1, M + 1], let U-q denote the set of numbers having a unique expansion in base q over the alphabet {0, 1, ... , M}, and let U-q denote the corresponding set of sequences in {0, 1, ... M}(N). Komornik et al. [Adv. Math. 305 (2017), 165-196] showed recently that the Hausdorff dimension of Uq is given by h(U-q)/log q, where h(U-q) denotes the topological entropy of U-q. They furthermore showed that the function H : q -> h(U-q) is continuous, nondecreasing and locally constant almost everywhere. The plateaus of H were characterized by Alcaraz Barrera et al. [Trans. Amer. Math. Soc., 371 (2019), 3209-3258]. In this article we reinterpret the results of Alcaraz Barrera et al. by introducing a notion of composition of fundamental words, and use this to obtain new information about the structure of the function H. This method furthermore leads to a more streamlined proof of their main theorem.
机译:对于正整数M且实数基数q是(1,M + 1]的元素,令Uq表示在字母{0,1,...,M}上基数q具有唯一扩展的数字集,并让Uq表示{0,1,... M}(N)中的相应序列集。Komornik等人[Adv。Math。305(2017),165-196]最近表明,Hausdorff维数为Uq由h(Uq)/ log q给出,其中h(Uq)表示Uq的拓扑熵,他们还表明函数H:q-> h(Uq)几乎在任何地方都是连续的,不递减的并且局部恒定的。 Alcaraz Barrera等[Trans。Amer。Math。Soc。,371(2019),3209-3258]表征了H的高原。在本文中,我们通过引入组成概念来重新解释Alcaraz Barrera等的结果的基本词,并以此来获得有关函数H的结构的新信息。此方法进一步导致对其主定理的更简化的证明。

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