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arXiv math/9804003math.GT
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正链环是强拟正的

Positive links are strongly quasipositive

Lee Rudolph

摘要:

设S(D)是通过将塞弗特算法应用于有向链路图D而产生的曲面。证明了若D没有负交叉,则S(D)是拟正的Seifert曲面,即S(D)不可压缩地嵌入在由正的Hopf环垂直的纤维曲面上.这个结果,结合“局部托姆猜想”的真理,有各种有趣的结果;例如,它产生了一个容易计算的估计的切片欧拉示性数的特点,链接L(D)(其中D是任意的),扩大和经常改善“切片-贝内昆不等式"的封闭辫子图;它导致了另一个证明的手征性的积极和几乎积极的结。

英文摘要:

Let S(D) be the surface produced by applying Seifert's algorithm to the oriented link diagram D. I prove that if D has no negative crossings then S(D) is a quasipositive Seifert surface, that is, S(D) embeds incompressibly on a fiber surface plumbed from positive Hopf annuli. This result, combined with the truth of the `local Thom Conjecture', has various interesting consequences; for instance, it yields an easily-computed estimate for the slice euler characteristic of the link L(D) (where D is arbitrary) that extends and often improves the `slice-Bennequin inequality' for closed-braid diagrams; and it leads to yet another proof of the chirality of positive and almost positive knots.

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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