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Correction terms and the non-orientable 4-genus

Presented by: 
Marco Golla Uppsala Universitet
Date: 
Thursday 9th February 2017 - 15:15 to 16:30
Venue: 
INI Seminar Room 2
Abstract: 
Given a knot K in the 3-sphere, we use Heegaard Floer d-invariants to give lower bounds on the first Betti number of a non-orientable surface in the 4-ball with boundary K, strengthening earlier work of Batson. An amusing feature of our bound is its superadditivity with respect to connected sums. This is joint work with Marco Marengon.



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