A Lower Bound on Unknotting Number

Citation:

Jiming MA,Ruifeng QIU.A Lower Bound on Unknotting Number[J].Chinese Annals of Mathematics B,2006,27(4):437~440
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Authors:

Jiming MA; Ruifeng QIU

Foundation:

Project supported by the National Natural Science Foundation of China (No.10171038).
Abstract: In this paper the authors use a modified Wirtinger presentation to give a lower bound on the unknotting number of a knot in $S^3$.

Keywords:

Unknotting number, Knot, Commutator subgroup

Classification:

57M05, 57M25
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