Infinite girth and profinite properties of residually finite groups
Abstract
We develop new methods for studying infinite girth in finitely generated residually finite groups, particularly those containing no non-abelian free subgroups and satisfying no non-trivial group law. Our main contribution is a probabilistic Nielsen-component lifting principle, based on product replacement graphs, which provides a criterion for transferring suitable generation and word-avoidance properties of finite quotients to the ambient group. As an application, we prove that every finitely generated group admitting infinitely many pairwise non-isomorphic non-abelian finite simple quotients has infinite girth, with extensions to quasisimple and, under additional hypotheses, almost-simple quotients. We further establish infinite girth for the B. H. Neumann group and the Bou-Rabee-Seward group, obtaining new results on the occurrence of non-abelian finite simple quotients and sections. By a different construction, we also prove that Alt_fin(Z) semidirect Z has infinite girth. Finally, we establish a marked finite-quotient characterization of infinite girth for finitely generated residually finite groups and prove that, for linear groups over fields of characteristic zero, large marked girth can be realized in congruence quotients. We conclude with several open questions and remarks arising from our results.
Related
- Hilbertian Fields and Profinite Iterated Monodromy Groups Over Transcendental Elements with Specializations of Infinite Index
- Nonsofic wreath products of residually finite groups
- Polycyclic groups and profinite isomorphism
- An algebro-geometric approach to profinite iterated monodromy groups
- Profinite groups whose closed subgroups are subnormal of defect at most two
BibTeX
@misc{mishra2026infinite,
title = {{Infinite girth and profinite properties of residually finite groups}},
author = {Pratyush Mishra},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.10925},
eprint = {2610.10925},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.10925},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Infinite girth and profinite properties of residually finite groups
AU - Pratyush Mishra
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2610.10925
UR - https://arxiv.org/abs/2610.10925
AB - We develop new methods for studying infinite girth in finitely generated residually finite groups, particularly those containing no non-abelian free subgroups and satisfying no non-trivial group law. Our main contribution is a probabilistic Nielsen-component lifting principle, based on product replacement graphs, which provides a criterion for transferring suitable generation and word-avoidance properties of finite quotients to the ambient group. As an application, we prove that every finitely generated group admitting infinitely many pairwise non-isomorphic non-abelian finite simple quotients has infinite girth, with extensions to quasisimple and, under additional hypotheses, almost-simple quotients. We further establish infinite girth for the B. H. Neumann group and the Bou-Rabee-Seward group, obtaining new results on the occurrence of non-abelian finite simple quotients and sections. By a different construction, we also prove that Alt_fin(Z) semidirect Z has infinite girth. Finally, we establish a marked finite-quotient characterization of infinite girth for finitely generated residually finite groups and prove that, for linear groups over fields of characteristic zero, large marked girth can be realized in congruence quotients. We conclude with several open questions and remarks arising from our results.
ER -