English

Finitely generated normal pro-$\mathcal C$ subgroups in right angled Artin pro-$\mathcal C$ groups

Group Theory 2023-05-08 v1

Abstract

Let C\mathcal{C} be a class of finite groups closed for subgroups, quotients groups and extensions. Let Γ\Gamma be a finite simplicial graph and G=GΓG = G_{\Gamma} be the corresponding pro-C\mathcal C RAAG. We show that if NN is a non-trivial finitely generated, normal, full pro-C\mathcal C subgroup of GG then G/NG/ N is finite-by-abelian. In the pro-pp case we show a criterion for NN to be of type FPnFP_n when G/NZpG/ N \simeq \mathbb{Z}_p. Furthermore for G/NG/ N infinite abelian we show that NN is finitely generated if and only if every normal closed subgroup N0G N_0 \triangleleft G containing NN with G/N0ZpG/ N_0 \simeq \mathbb{Z}_p is finitely generated. For G/NG/ N infinite abelian with NN weakly discretely embedded in GG we show that NN is of type FPnFP_n if and only if every N0G N_0 \leq G containing NN with G/N0ZpG/ N_0 \simeq \mathbb{Z}_p is of type FPnFP_n.

Keywords

Cite

@article{arxiv.2305.03683,
  title  = {Finitely generated normal pro-$\mathcal C$ subgroups in right angled Artin pro-$\mathcal C$ groups},
  author = {Dessislava Kochloukova and Pavel Zalesskii},
  journal= {arXiv preprint arXiv:2305.03683},
  year   = {2023}
}
R2 v1 2026-06-28T10:27:09.713Z