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Unknotting number and number of Reidemeister moves needed for unlinking
link diagram Reidemeister move Hass-Nowik knot diagram invariant
2011/2/22
Using unknotting number, we introduce a link diagram invariant of Hass and Nowik type, which changes at most by 2 under a Reidemeister move. As an application,we show that a certain infinite sequence ...
A note on knots with H(2)-unknotting number one
H(2)-unknotting number Goeritz matrix Ozsv´ ath-Szab´ o correction term Heegaard Floer homology
2010/12/8
We give an obstruction to unknotting a knot by adding a twisted band,derived from Heegaard Floer homology.