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A note on knots with \(\mathrm{H}(2)\)-unknotting number one. (English) Zbl 1302.57037

Summary: We give an obstruction to unknotting a knot by adding a twisted band, derived from Heegaard Floer homology.

MSC:

57M27 Invariants of knots and \(3\)-manifolds (MSC2010)
57M25 Knots and links in the \(3\)-sphere (MSC2010)
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References:

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