Nilfactors of R^m-actions and configurations in sets of positive upper density in R^m

Details Nilfactors of R^m-actions and configurations in sets of positive upper density in R^m Nilfactors of R^m-actions and configurations in sets of positive upper density in R^m

2005-05-12

arxiv.org/abs/math/0505276v1

Journal d'Analyse Math\'ematique 99 (2006) 249-266

Mathematics

Dynamical Systems

Scientific paper

10.1007/BF02789447

We use ergodic theoretic tools to solve a classical problem in geometric Ramsey theory. Let E be a measurable subset of R^m, with positive upper density. Let V={0,v_1,...,v_k} be a subset of R^m. We show that for r large enough, we can find an isometric copy of rV arbitrarily close to E. This is a generalization of a theorem of Furstenberg, Katznelson and Weiss showing a similar property for m=k=2.

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