English

Profinite groups with restricted centralizers of $\pi$-elements

Group Theory 2021-12-30 v2

Abstract

A group GG is said to have restricted centralizers if for each gg in GG the centralizer CG(g)C_G(g) either is finite or has finite index in GG. Shalev showed that a profinite group with restricted centralizers is virtually abelian. Given a set of primes π\pi, we take interest in profinite groups with restricted centralizers of π\pi-elements. It is shown that such a profinite group has an open subgroup of the form P×QP\times Q, where PP is an abelian pro-π\pi subgroup and QQ is a pro-π\pi' subgroup. This significantly strengthens a result from our earlier paper.

Keywords

Cite

@article{arxiv.2107.00491,
  title  = {Profinite groups with restricted centralizers of $\pi$-elements},
  author = {Cristina Acciarri and Pavel Shumyatsky},
  journal= {arXiv preprint arXiv:2107.00491},
  year   = {2021}
}

Comments

final version, some typos corrected, some references updated. arXiv admin note: text overlap with arXiv:2003.09933

R2 v1 2026-06-24T03:48:32.976Z