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arXiv 0910.2872math.GT
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两桥纽结的Goeritz矩阵和签名

The Goeritz matrix and signature of a two bridge knot

Michael Gallaspy, Stanislav Jabuka

摘要:

根据Gordon和Litherland的公式,一个节点K的签名可以计算为K的Goeritz矩阵的签名减去一个适当的校正项,从K的图中读出。本文考虑两个桥结点族K(p/q),并根据p/q的连分数展开式的系数计算其Goeritz矩阵的特征.在许多情况下,我们还计算校正项的值。我们表明,对于每两个桥结K(p/q),有“甚至连分数扩展”的p/q,其中的校正项为零,从而充分计算的签名K(p/q)。我们提供了一个算法,寻找偶连分数的扩展。本文是第一作者在第二作者的指导下进行的REU研究的结果。

英文摘要:

According to a formula by Gordon and Litherland, the signature of a knot K can be computed as the signature of a Goeritz matrix of K minus a suitable correction term, read off from the diagram of K. In this article, we consider the family of two bridge knots K(p/q) and compute the signature of their Goeritz matrices in terms of the coefficients of the continued fraction expansion of p/q. In many cases we also compute the value of the correction term. We show that for every two bridge knot K(p/q), there are "even continued fraction expansions" of p/q, for which the correction term vanishes, thereby fully computing the signature of K(p/q). We provide an algorithm for finding even continued fraction expansions. This article is the result of an REU study conducted by the first author under the direction of the second.

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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