Functoriality conjecture for the knot homology theory

Consider an embedded cobordism in I×S3I\times S^3 between knots in S3S^3, equipped with a Morse presentation and decomposed into Reidemeister moves and handle attachments. Assign maps to Reidemeister moves, births and deaths of circles, and saddle cobordisms using the indicated fixed isomorphisms and units or counits of the adjunctions.

Functoriality conjecture. This assignment of a map to a cobordism is independent of the choice of Morse function, i.e. this makes the knot homology theory K()\mathcal{K}(-) functorial.

The conjecture would provide functoriality with respect to cobordisms, extending the known functorial behavior of Khovanov homology; the source presents it without a proof or resolution.

Sources & referencesView supporting material

Primary source

Ben Webster, “Knot invariants and higher representation theory”, arXiv:1309.3796 (2015).

Additional references

2 papers in this index state this conjecture (2010–2013). The statement above is taken from the most recent of them; the others are arXiv:1005.4559.

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