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Jessica Liu, PMA 12.166: Signatures of Links (and How to Compute them)
Monday, January 29, 2024, 02:00pm - 03:00pm
The Levine-Tristram signature of a link is a classical invariant with many definitions and applications - it is closely related to the Alexander polynomial, provides lower bounds on topological invariants such as the slice and doubly slice genus, and is almost-everywhere a concordance invariant. In 2018 Kashaev introduced a link invariant using a simple algorithm on link diagrams which he conjectured also computes the Levine-Tristram signature. In this talk we give a proof of Kashaev's conjecture using the original Seifert surface definition of the Levine-Tristram signature. The proof also gives another way of computing the Alexander polynomial.
Location: PMA 12.166

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