A FAMILY OF INTEGER-VALUED COMPLETE INVARIANTS OF ORIENTED KNOT TYPES
A FAMILY OF INTEGER-VALUED COMPLETE INVARIANTS OF ORIENTED KNOT TYPES
复制标题
定向结类型的整数值完全不变量族
DOI:
10.1142/s0218216501001384
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发表时间:
2001
影响因子:
0.5
通讯作者:
Yoshiyuki Nakagawa
中科院分区:
文献类型:
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作者:
Yoshiyuki Nakagawa
By using Ghrist's theorem that universal templates exist, we define a family of integer-valued invariants {νn} of oriented knot types, each of which is complete. We give (1) an estimation of νn(K) from below in terms of the genus of K and (2) an estimation of νn(K) from above in terms of the word length of a braid presentation of K. To do this, we introduce a yet another invariant λn(K) and give an estimation of λn(K). Moreover, we show that the estimation of λn(K) from below is best possible, by explicitly determining the invariant νn(K) for some knots.