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SUMMARY:Nonsqueezable Klein bottles - Jonny Evans (Lancaster)
DTSTART:20250312T160000Z
DTEND:20250312T170000Z
UID:TALK227767@talks.cam.ac.uk
CONTACT:Ailsa Keating
DESCRIPTION:Given a symplectic 4-manifold and a Z/2-homology class B\, one
  can find a non-orientable Lagrangian submanifold L representing B. The va
 lue of the Euler characteristic of L is determined modulo 4 by the homolog
 y class B\, but can be arbitrarily negative. For a given homology class B\
 , what is the maximum Euler characteristic that can be achieved? And how d
 oes this depend on the cohomology class of the symplectic form? This is a 
 hard question\; I will explain what we know about the answer for the case 
 when X is a product of two 2-spheres. (Joint with Nikolas Adaloglou.)
LOCATION:MR13
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