Soficity for group actions on sets and applications
Group Theory
2025-08-29 v3 Operator Algebras
Abstract
In this article we develop a notion of soficity for actions of countable groups on sets. We show two equivalent perspectives, several natural properties and examples. Notable examples include arbitrary actions of both amenable groups and free groups, and actions of sofic groups with locally finite stabilizers. As applications we prove soficity for generalized wreath products (and amalgamated free generalized wreath products) of sofic groups where the underlying group action is sofic. This generalizes the result of Hayes and Sale [HS18], and proves soficity for many new families of groups.
Keywords
Cite
@article{arxiv.2401.04945,
title = {Soficity for group actions on sets and applications},
author = {David Gao and Srivatsav Kunnawalkam Elayavalli and Gregory Patchell},
journal= {arXiv preprint arXiv:2401.04945},
year = {2025}
}
Comments
Final version, published in Research in the Mathematical Sciences