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arXiv 1812.06930math.GT
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循环Heegaard分裂的距离

A Distance for Circular Heegaard Splittings

Kevin Lamb, Patrick Weed

AI总结:

本文基于圆周值Morse函数定义了$E(K)$的循环Heegaard分裂及其循环距离,并证明当循环距离过大时,$E(K)$无法包含低亏格不可压缩曲面且极小亏格Seifert曲面合痕唯一。

摘要:

对于结$K\subset S^3$,其外部$E(K) = S^3\backslashη(K)$具有由$K$的Seifert曲面导出的奇异叶状结构,该结构源自一个圆周值Morse函数$f\colon E(K)\to S^1$。当$f$是自指标的且没有指标为0或3的临界点时,分离指标1和指标2临界点的正则层将$E(K)$分解为一对压缩体。我们将这样的分解称为$E(K)$的循环Heegaard分裂。我们为这类Heegaard分裂定义了循环距离的概念(类似于Hempel距离),并证明在某些情况下它可以被界定。具体而言,如果循环Heegaard分裂的循环距离过大:(1)$E(K)$不能包含低亏格不可压缩曲面,(2)$K$的极小亏格Seifert曲面在合痕意义下是唯一的。

英文摘要:

For a knot $K\subset S^3$, its exterior $E(K) = S^3\backslashη(K)$ has a singular foliation by Seifert surfaces of $K$ derived from a circle-valued Morse function $f\colon E(K)\to S^1$. When $f$ is self-indexing and has no critical points of index 0 or 3, the regular levels that separate the index-1 and index-2 critical points decompose $E(K)$ into a pair of compression bodies. We call such a decomposition a circular Heegaard splitting of $E(K)$. We define the notion of circular distance (similar to Hempel distance) for this class of Heegaard splitting and show that it can be bounded under certain circumstances. Specifically, if the circular distance of a circular Heegaard splitting is too large: (1) $E(K)$ can't contain low-genus incompressible surfaces, and (2) a minimal-genus Seifert surface for $K$ is unique up to isotopy.

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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