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Equicontinuous delone dynamical systems

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arxiv 1105.3855 v1 pith:LI4TXBJE submitted 2011-05-19 math.DS

classification math.DS
keywords delonesystemsequicontinuouscrystallinedynamicalalmostclasscomplexity
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We characterize equicontinuous Delone dynamical systems as those coming from Delone sets with strongly almost periodic Dirac combs. Within the class of systems with nite local complexity the only equicontinuous systems are then shown to be the crystalline ones. On the other hand, within the class without nite local complexity, we exhibit examples of equicontinuous minimal Delone dynamical systems which are not crystalline. Our results solve the problem posed by Lagarias whether a Delone set whose Dirac comb is strongly almost periodic must be crystalline.

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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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