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On the super additivity of tunnel number of knots

โœ Scribed by Kanji Morimoto

Publisher
Springer
Year
2000
Tongue
English
Weight
205 KB
Volume
317
Category
Article
ISSN
0025-5831

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Let K be an unknotting number one knot. By calculating Casson's invariant for the 2-fold branched covering of S3 branched over K, we give some relations among the Jones polynomial, the signature, and the Conway polynomial of K, and prove that some knots are of unknotting number two.