On uniform asymptotic upper density in locally compact abelian groups

Details On uniform asymptotic upper density in locally compact abelian groups On uniform asymptotic upper density in locally compact abelian groups

2009-04-09

arxiv.org/abs/0904.1567v1

Mathematics

Classical Analysis and ODEs

Scientific paper

Starting out from results known for the most classical cases of N, Z^d, R^d or for sigma-finite abelian groups, here we define the notion of asymptotic uniform upper density in general locally compact abelian groups. Even if a bit surprising, the new notion proves to be the right extension of the classical cases of Z^d, R^d. The new notion is used to extend some analogous results previously obtained only for classical cases or sigma-finite abelian groups. In particular, we show the following extension of a well-known result for Z of Furstenberg: if in a general locally compact Abelian group G a subset S of G has positive uniform asymptotic upper density, then S-S is syndetic.

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