Seminars & Colloquia Calendar

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Topology/Geometry Seminar

Hidden Symmetries and Commensurability of 2-bridge link complements

William Worden (Temple University)

Location:  Hill 525
Date & time: Tuesday, 10 April 2018 at 3:30PM - 4:30PM

Abstract:  The canonical triangulations and symmetry groups of 2-bridge link complements are well understood and relatively easy to describe. We leverage this fact to show that non-arithmetic 2-bridge link complements have no hidden symmetries (i.e., symmetries of a finite cover that do not descend to symmetries of the link complement itself), and are pairwise incommensurable. I will discuss the relevant background material, and give a rough sketch of the proof.

This is joint work with Christian Millichap.

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