Strongly bounded generation in transformation groups
Abstract
Word metrics on finitely generated groups have canonical quasi-isometry classes, making quasi-isometry invariants genuine group invariants. Rosendal generalized this phenomenon to topological groups through CB-generation, but in the general topological setting the resulting quasi-isometry invariants are not invariants of the underlying abstract group. Specializing to the discrete case yields what we call SB-generated groups, where the invariants are genuinely algebraic. We show that SB-generation arises naturally in transformation groups by identifying several broad families of examples: the identity component of homeomorphism groups of closed manifolds, certain big mapping class groups, and homeomorphism groups of compact well-ordered spaces with successor limit capacity. These results demonstrate that SB-generation provides a robust extension of finite generation.
Cite
@article{arxiv.2510.07541,
title = {Strongly bounded generation in transformation groups},
author = {Nicholas G. Vlamis},
journal= {arXiv preprint arXiv:2510.07541},
year = {2026}
}
Comments
22 pages, 1 figure, v2: fixed typesetting issue with cleverref, correcting referencing of propositions, lemmas, and corollaries: no mathematical change