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We show that the order of torsion homology classes in Bar-Natan deformationof Khovanov homology is a lower bound for the unknotting number. We giveexamples of knots that this is a better lower bound than |s(K)/2|, where s(K)is the Rasmussen s invariant defined by the Bar-Natan spectral sequence.

The Bar-Natan homology and unknotting number