Calculating Bar-Natan's characteristic two Khovanov homology
arXiv:math/0411225
Abstract
We investigate Bar-Natan's characteristic two Khovanov link homology theory studying both the filtered and bi-graded theories. The filtered theory is computed explicitly and the bi-graded theory analysed by setting up a family of spectral sequences. The E_2-pages can be described in terms of groups arising from the action of a certain endomorphism on mod 2 Khovanov homology. Some simple consequences are discussed.
18 pages, 12 figures; substantially re-written; now includes reduced theory; hypothesis removed from application