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arXiv math/9912050math.GT
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没有平行切线的结和连接

Knots and links without parallel tangents

Ying-Qing Wu

摘要:

Steinhaus证明了每一条闭的有向$C^1$ -曲线都有一对反平行切线。波特通过证明存在没有反平行切线的曲线来反驳这个猜想。柯林·亚当斯提出了一个问题:在$\R^3$中是否存在一个非平凡的纽结,它没有平行或反平行的切线。本文的主要结果解决了这个问题,表明任何(光滑或多边形)链接$L$在$\R^3$是同位素的光滑链接$\hat L$没有平行或反平行切线。

英文摘要:

Steinhaus conjectured that every closed oriented $C^1$-curve has a pair of anti-parallel tangents. Porter disproved the conjecture by showing that there exist curves with no anti-parallel tangents. Colin Adams rised the question of whether there exists a nontrivial knot in $\R^3$ which has no parallel or antiparallel tangents. The main result of this paper solves this problem, showing that any (smooth or polygonal) link $L$ in $\R^3$ is isotopic to a smooth link $\hat L$ which has no parallel or antiparallel tangents.

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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