140 citations · 1.3k across the 89 of their papers we have counts for
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math.GR2003★ 10 cited
The Automorphism Tower of Groups acting on Rooted Trees
Laurent Bartholdi, Said N. Sidki
The group of isometries W of a regular rooted tree, and many of its subgroups with branching structure, have groups of automorphisms induced by conjugation in W. This fact has stim…
math.GR2003★ 140 cited
Amenability via random walks
Laurent Bartholdi, Balint Virag
We answer an open question of Grigorchuk and Zuk about amenability using random walks. Our results separate the class of amenable groups from the closure of subexponentially growin…