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Tilings of amenable groups

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arxiv 1502.02413 v1 pith:4KZL3QKI submitted 2015-02-09 math.GR

classification math.GR
keywords amenableentropyepsilonfinitesubsettilestilingtopological
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abstract

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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  1. Pure point measures with sparse support and sparse Fourier--Bohr support

    math.MG 2019-08 accept novelty 7.0 of 10

    Doubly sparse measures on second countable locally compact Abelian groups are shown to be supported on finitely many translates of a lattice with trigonometric polynomial amplitudes.

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