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arxiv: 1502.02413 · v1 · pith:4KZL3QKInew · submitted 2015-02-09 · 🧮 math.GR

Tilings of amenable groups

classification 🧮 math.GR
keywords amenableentropyepsilonfinitesubsettilestilingtopological
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We prove that for any infinite countable amenable group $G$, any $\epsilon > 0$ and any finite subset $K\subset G$, there exists a tiling (partition of $G$ into finite "tiles" using only finitely many "shapes"), where all the tiles are $(K; \epsilon)$-invariant. Moreover, our tiling has topological entropy zero (i.e., subexponential complexity of patterns). As an application, we construct a free action of $G$ (in the sense that the mappings, associated to different from unity elements of $G$, have no fixpoints), on a zero-dimensional space, and which has topological entropy zero.

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