Abstract
We give a fresh introduction to the Khovanov Homology theory for knots and links, with special emphasis on its extension to tangles, cobordisms and 2–knots. By staying within a world of topological pictures a little longer than in other articles on the subject, the required extension becomes essentially tautological. And then a simple application of an appropriate functor (a “TQFT”) to our pictures takes them to the familiar realm of complexes of (graded) vector spaces and ordinary homological invariants.
Citation
Dror Bar-Natan. "Khovanov's homology for tangles and cobordisms." Geom. Topol. 9 (3) 1443 - 1499, 2005. https://doi.org/10.2140/gt.2005.9.1443
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