Charlotte Scott Centre for Algebra

On the 20th of June 2019 **Dr Rachel Skipper (Georg-August-Universität Göttingen and École Normale Supérieure de Lyon)** visited Charlotte Scott Centre for Algebra and gave a talk “On the Cantor–Bendixson rank of the Grigorchuk group and the Gupta–Sidki 3-group”. Her visit is supported by the London Mathematical Society Grant Scheme 2 (Visits to the UK) and by the Lincoln Institute of Advanced Studies.

*Abstract*: We study the Cantor–Bendixson rank for the space of subgroups of the Grigorchuk group and the Gupta–Sidki group. In particular, we show that for $latex G$ the Grigorchuk group or the Gupta–Sidki 3-group, the Cantor–Bendixson rank of $latex Sub(G)$ is $latex omega$. This is a joint project with Phillip Wesolek.”

Callum Burrows, Sandro Mattarei, Rachel Skipper, Anitha Thillaisundaram, Simon Smith, Evgeny Khukhro

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