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arXiv 1503.06251math.DSmath.GR
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amenable groups上的符号动力学:一般移位的熵

Symbolic dynamics on amenable groups: the entropy of generic shifts

Joshua Frisch, Omer Tamuz

摘要:

设$G$是一个随机生成的顺从群。研究了有限字母表$A$上$G$的移位空间.我们表明,零熵移位是通用的在这个空间中,更一般的熵移位$c$是通用的在空间中的熵至少$c$。这同样适用于传递移位空间和弱混合移位空间。作为这一结果的应用,我们证明了对每个熵值$c \in [0,\log |A|]$,存在$A^G$与熵$c$的弱混合子移位.我们还证明了强不可约移位的集合在移位空间中不形成$G_δ$,并且所有非平凡的强不可约移位在这个空间中都是非孤立点。

英文摘要:

Let $G$ be a finitely generated amenable group. We study the space of shifts on $G$ over a given finite alphabet $A$. We show that the zero entropy shifts are generic in this space, and that more generally the shifts of entropy $c$ are generic in the space of shifts with entropy at least $c$. The same is shown to hold for the space of transitive shifts and for the space of weakly mixing shifts. As applications of this result, we show that for every entropy value $c \in [0,\log |A|]$ there is a weakly mixing subshift of $A^G$ with entropy $c$. We also show that the set of strongly irreducible shifts does not form a $G_δ$ in the space of shifts, and that all non-trivial, strongly irreducible shifts are non-isolated points in this space.

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