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SUMMARY:Correction terms and the non-orientable 4-genus - Marco Golla (Upp
 sala Universitet)
DTSTART:20170209T151500Z
DTEND:20170209T163000Z
UID:TALK70942@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Given a knot K in the 3-sphere\, we use Heegaard Floer d-invar
 iants 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 B
 atson. An amusing   feature of our bound is its superadditivity with respe
 ct to connected sums.  This is joint work with Marco Marengon.  <br><br><b
 r><br>
LOCATION:Seminar Room 2\, Newton Institute
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