English

Approximate subgroups with bounded VC-dimension

Group Theory 2024-10-21 v2 Combinatorics Logic

Abstract

We combine the fundamental results of Breuillard, Green, and Tao on the structure of approximate groups, together with "tame" arithmetic regularity methods based on work of the authors and Terry, to give a structure theorem for finite subsets AA of arbitrary groups GG where AA has "small tripling" and bounded VC-dimension: Roughly speaking, up to a small error, AA will be a union of a bounded number of translates of a coset nilprogression of bounded rank and step (see Theorem 2.1). We also prove a stronger result in the setting of bounded exponent (see Theorem 2.2). Our results extend recent work of Martin-Pizarro, Palac\'{i}n, and Wolf on finite stable sets of small tripling.

Keywords

Cite

@article{arxiv.2004.05666,
  title  = {Approximate subgroups with bounded VC-dimension},
  author = {Gabriel Conant and Anand Pillay},
  journal= {arXiv preprint arXiv:2004.05666},
  year   = {2024}
}

Comments

38 pages, some changes in Section 6

R2 v1 2026-06-23T14:48:39.552Z