Title:  Khovanov homology and 4-manifold invariants
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Abstract:  I'll describe an invariant of smooth 4-manifolds defined in terms of
Khovanov homology. It associates a doubly-graded vector space to each
4-manifold (optionally with a link in its boundary), generalizing the
Khovanov homology of a link in the boundary of the standard 4-ball.
I'll finish by talking about relations to TQFT, and the prospects for
concrete calculations. This is joint work with Chris Douglas and Kevin
Walker.