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 𝔽 2 -Khovanov homology. Some simple consequences are discussed.
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Paul Turner (2006) studied this question.
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