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arXiv 0810.3742math.GT
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3-球面中纽结的圆薄位置

Circular thin position for knots in the 3-sphere

F. Manjarrez-Gutierrez

摘要:

纽结补集C(K)= S^3 \K上的正则圆值莫尔斯函数是从C(K)到S^1的函数f,它分离临界点,并且在纽结的邻域中表现良好。这样一个函数在纽结外部E(K)= S^3 \N(K)上引起一个柄分解,其性质是每个正则水平曲面都包含纽结的一个塞弗特曲面。我们重新排列控制柄,使规则曲面尽可能简单。为了使这一点更精确,引入了E(K)的圆宽度的概念。当E(K)被赋予实现圆宽度的柄分解时,我们将说纽结K处于圆薄位置。我们用这个来表明,许多节点有一个以上的非同位素不可压缩塞弗特表面。我们还分析了一些纽结操作下的循环宽度的行为。

英文摘要:

A regular circle-valued Morse function on the knot complement C(K) = S^3\K is a function f from C(K) to S^1 which separates critical points and which behaves nicely in a neighborhood of the knot. Such a function induces a handle decomposition on the knot exterior E(K) = S^3\N (K), with the property that every regular level surface contains a Seifert surface for the knot. We rearrange the handles in such a way that the regular surfaces are as simple as possible. To make this precise the concept of circular width for E(K) is introduced. When E(K) is endowed with a handle decomposition which realizes the circular width we will say that the knot K is in circular thin position. We use this to show that many knots have more than one non-isotopic incompressible Seifert surface. We also analyze the behavior of the circular width under some knot operations.

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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