The galaxy of Coxeter groups
Abstract
In this paper we introduce the galaxy of Coxeter groups -- an infinite dimensional, locally finite, ranked simplicial complex which captures isomorphisms between Coxeter systems. In doing so, we would like to suggest a new framework to study the isomorphism problem for Coxeter groups. We prove some structural results about this space, provide a full characterization in small ranks and propose many questions. In addition we survey known tools, results and conjectures. Along the way we show profinite rigidity of triangle Coxeter groups -- a result which is possibly of independent interest.
Cite
@article{arxiv.2211.17038,
title = {The galaxy of Coxeter groups},
author = {Yuri Santos Rego and Petra Schwer},
journal= {arXiv preprint arXiv:2211.17038},
year = {2025}
}
Comments
30 pages, 6 figures. v2: Incorporated referee's suggestions; Corrected a mistake in the proof of Theorem 4.25 (formerly 4.24), improved other proofs and text; v3: Corrected a few typos, final version. (Journal of Algebra (2023), in press.)