Khovanov-Rozansky gl_N link homology carries a functorial action of the positive Witt algebra, making link cobordisms equivariant maps between twisted homology groups.
An sl(2) tangle homology and seamed cobordisms
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An action of the Witt algebra on Khovanov-Rozansky homology
Khovanov-Rozansky gl_N link homology carries a functorial action of the positive Witt algebra, making link cobordisms equivariant maps between twisted homology groups.