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arXiv 1302.3835math.GNmath.GT
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关于具有最小超越的纽结图的半穿线

On the semi-threading of knot diagrams with minimal overpasses

Jae-Wook Chung, Seulgi Jeong, Dongseok Kim

摘要:

给定一个纽结图$D$,我们构造了一个半穿线圆,它可以是$D$的一个轴,作为一个封闭的辫子,取决于纽结图。特别是,我们认为半线程圆的最小图的结相对于立交桥,给我们一些信息有关的编织指数。通过这个概念,我们证明了,对于每个非平凡结$K$,$K$的辫子指数$b(K)$不小于图的最小立交桥数$l(K)$。此外,它们对于环面结是相同的。

英文摘要:

Given a knot diagram $D$, we construct a semi-threading circle for it which can be an axis of $D$ as a closed braid depending on knot diagrams. In particular, we consider semi-threading circles for minimal diagrams of a knot with respect to overpasses which give us some information related to the braid index. By this notion, we show that, for every nontrivial knot $K$, the braid index $b(K)$ of $K$ is not less than the minimum number $l(K)$ of overpasses of diagrams. Moreover, they are the same for a torus knot.

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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