Metaplectic link invariants

Metaplectic link invariants
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Metaplectic 链接不变量

DOI:
10.1007/bf00147477
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发表时间:
1989
影响因子:
0.5
通讯作者:
V. Jones
V. Jones
中科院分区:
数学4区
文献类型:
--
作者:
D. Goldschmidt;V. Jones

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众所周知I-1,(2.1)], r3中的每个定向链接都是封闭辫状结构的同位素。如果~是一个辫状结构,我们用~表示它的“闭包”(即对应的定向链接)。马尔可夫定理[-1,(2.3)]给出了两个辫状体具有同位素闭包的充分必要条件。利用这一结果,构造了使w (00) = w (fl)每当~----fl时的复值函数w(~),从而得到了一组面向连杆的不变量。更准确地说,设B,+ x是n+ 1个字符串上的Artin Braid群,其生成器为a 1, o2,…,关于满足关系aiai+ l~ i~-ai+ l (Tiai+ l (1~< i< n) aiaj= ajai(1i-Jl/> 2)。
It is well known I-1,(2.1)] that every oriented link in R 3 is isotopic to a closed braid. If~ is a braid, we denote its' closure'(ie the corresponding oriented link) by~. A theorem of Markov [-1,(2.3)] gives necessary and sufficient conditions for two braids to have isotopic closures. Using this result, we construct complex-valued functions w (~) such that w (00= w (fl) whenever~----fl, thereby obtaining a set of invariants for oriented links. More precisely, let B,+ x be the Artin Braid group on n+ 1 strings with generators a 1, o2,..., on satisfying the relations aiai+ l~ i~-ai+ l (Tiai+ l (1~< i< n) aiaj= ajai(1i-Jl/> 2).