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We construct a spectral sequence relating the Khovanov homology of a stronglyinvertible knot to the annular Khovanov homologies of the two natural quotientknots. Using this spectral sequence, we re-prove that Khovanov homologydistinguishes certain slice disks. We also give an analogous spectral sequencefor the Heegaard Floer homology of the branched double cover.

Khovanov homology of strongly invertible knots and their quotients