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math.GR2013★ 13 cited
Abstract commensurability and the Gupta--Sidki group
Alejandra Garrido
We study the subgroup structure of the infinite torsion -groups defined by Gupta and Sidki in 1983. In particular, following results of Grigorchuk and Wilson for the first Grigo…
math.GR2013
On subgroups of finite index in branch groups
Alejandra Garrido, John S. Wilson
We give a structural description of the normal subgroups of subgroups of finite index in branch groups in terms of rigid stabilizers. This gives further insight into the structure…