Laboratoire de Mathématiques de Besançon - UMR 6623 CNRS

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My favourite branch groups.

par Bobbia Benjamin - publié le

Jared White

Branch groups are certain groups of tree automorphisms that have a track record
of providing counterexamples to famous conjectures. They come with a beauti-
ful self-similar structure. In the talk I will describe two of the most well-known
examples, the Grigorchuk group , and the Gupta-Sidki 3-group. Time permit-
ting, I will briefly describe how they can be used to solve a problem about the
second duals of group algebras.