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A Gordon-Litherland form for ribbon surfaces

Presented by: 
Brendan Owens University of Glasgow
Date: 
Thursday 2nd February 2017 - 15:30 to 16:30
Venue: 
INI Seminar Room 1
Abstract: 
Co-authors: Josh Greene and Saso Strle

I will describe work in progress aimed at generalising the Gordon-Litherland form to the case of properly embedded surfaces in the four-ball and the four-sphere.  I will also discuss a motivating non-application involving concordance invariants of links which lie on definite surfaces in S^4.


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University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons