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Categorification of the Kauffman bracket skein module of<i>I</i>–bundles over surfaces
Khovanov defined graded homology groups for links L ⊂ R 3 and showed that their polynomial Euler characteristic is the Jones polynomial of L. Khovanov's construction does not extend in a straightforward way to links in I -bundles M over surfaces F = D 2 (except for the homology with …