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arXiv 0907.1070math.GT
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环的Casson-Lin型不变量

A Casson-Lin type invariant for links

Eric Harper, Nikolai Saveliev

摘要:

通过计算具有非平凡第二Stiefel-Whitney类的链群的投影SU(2)表示,我们定义了S^3中两分量链的整数值不变量。我们表明,我们的不变量是,直到签署,链接的环绕数。我们的构造推广了X的构造。S.林在S^3中为纽结定义了一个类似的不变量;他的不变量等于纽结签名的一半。

英文摘要:

We define an integer valued invariant for two-component links in S^3 by counting projective SU(2) representations of the link group having non-trivial second Stiefel-Whitney class. We show that our invariant is, up to sign, the linking number of the link. Our construction generalizes that of X.-S. Lin who defined a similar invariant for knots in S^3; his invariant equals half the knot signature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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