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Commensuration index growth

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If you have a question about this talk, please contact Maurice Chiodo.

The title refers to an asymptotic invariant of a pair (G, U) consisting of a group G and a commensurated subgroup U < G such that G is generated by finitely many cosets of U. The goal of the talk is to introduce this invariant, discuss examples and present the first results of its investigation. This is based on joint work with Colin Reid and Phillip Wesolek.

This talk is part of the Geometric Group Theory (GGT) Seminar series.

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