Extensions of Schreiber’s theorem on discrete approximate subgroups in $\protect \mathbb{R}^d$
/ Authors
/ Abstract
In this paper we give an alternative proof of Schreiber's theorem which says that an infinite discrete approximate subgroup in $\mathbb{R}^d$ is relatively dense around a subspace. We also deduce from Schreiber's theorem two new results. The first one says that any infinite discrete approximate subgroup in $\mathbb{R}^d$ is a restriction of a Meyer set to a thickening of a linear subspace in $\mathbb{R}^d$, and the second one provides an extension of Schreiber's theorem to the case of the Heisenberg group.
Journal: Journal de l’École polytechnique — Mathématiques
DOI: 10.5802/JEP.90