THE UNKNOTTING NUMBER AND CLASSICAL INVARIANTS II
THE UNKNOTTING NUMBER AND CLASSICAL INVARIANTS II
复制标题
解开数和经典不变量 II
DOI:
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发表时间:
2012
影响因子:
0.5
通讯作者:
Stefan Friedl
中科院分区:
文献类型:
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作者:
Maciej Borodzik;Stefan Friedl
Abstract In [3] the authors (M. Borodzik and S. Friedl, Unknotting number and classical invariants (preprint 2012)) associated to a knot K ⊂ S3 an invariant nℝ(K), which is defined using the Blanchfield form and which gives a lower bound on the unknotting number. In this paper, we express nℝ(K) in terms of the Levine-Tristram signatures and nullities of K. We also show in the proof that the Blanchfield form for any knot K is diagonalisable over ℝ[t±1].