On profinite groups with commutators covered by countably many cosets
Group Theory
2017-11-15 v1
Abstract
Let w be a group-word. Suppose that the set of all w-values in a profinite group G is contained in a union of countably many cosets of subgroups. We are concerned with the question to what extent the structure of the verbal subgroup w(G) depends on the properties of the subgroups. We prove the following theorem. Let C be a class of groups closed under taking subgroups, quotients, and such that in any group the product of finitely many normal C-subgroups is again a C-subgroup. If w is a multilinear commutator and G is a profinite group such that the set of all w-values is contained in a union of countably many cosets g_iG_i where each G_i is in C, then the verbal subgroup w(G) is virtually-C. This strengthens several known results.
Cite
@article{arxiv.1711.04859,
title = {On profinite groups with commutators covered by countably many cosets},
author = {Eloisa Detomi and Marta Morigi and Pavel Shumyatsky},
journal= {arXiv preprint arXiv:1711.04859},
year = {2017}
}