Invariable generation of certain branch groups

Charles Garnet Cox, Anitha Thillaisundaram*

*Corresponding author for this work

Research output: Working paper


We investigate invariable generation among key examples of branch groups. In particular, we prove that all generating sets of the torsion Grigorchuk groups, of the branch Grigorchuk-Gupta-Sidki groups and of the torsion multi-EGS groups (which are natural generalisations of the Grigorchuk-Gupta-Sidki groups) are invariable generating sets. Furthermore, for the first Grigorchuk group and the torsion Grigorchuk-Gupta-Sidki groups, every finitely generated subgroup has a finite invariable generating set. We also show that a branch Grigorchuk-Gupta-Sidki group is almost 3/2-generated, that the diameter of its generating subgraph Δ(G) is 2 and its total domination number is 2. Some of our results apply to groups for which every maximal subgroup is normal. This class, known as MN, includes all nilpotent groups.
Original languageEnglish
Number of pages11
Publication statusSubmitted - 23 Nov 2023


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