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Generalized Bestvina-Brady groups and their applications

Presented by: 
Ian Leary University of Southampton
Wednesday 21st June 2017 - 09:00 to 10:00
INI Seminar Room 1
Co-authors: Robert Kropholler (Tufts University), Ignat Soroko (University of Oklahoma)

In the 1990's Bestvina and Brady used Morse theory to exhibit (as subgroups of right-angled Artin groups) the first examples of groups that are but not finitely presented.

The speaker has generalized this construction, via branched coverings, to construct continuously many groups of type , including groups of type FP that do not embed in any finitely presented group.

I shall discuss the construction and some applications, including the theorem that every countable group embeds in a group of type and the construction of continuously many quasi-isometry classes of acyclic 4-manifolds admitting free, cocompact, properly discontinuous discrete group action (the latter joint with Robert Kropholler and Ignat Soroko).

Related Links
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    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons