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arXiv 1507.01385math.GT
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三叶草链接的Milnor不变量

The Milnor invariants of clover links

Kodai Wada, Akira Yasuhara

摘要:

J. P. Levine引入了三叶草链接来研究链接的Milnor不变量的不确定性。结果表明,对于三叶草链,如果长度至多为$k$的Milnor数为零,则长度至多为$2k+1$的Milnor数是定义良好的;如果长度为$k+1$的Milnor数为零,则长度至少为$2k+2$的Milnor数不是定义良好的.对于三叶草链接$c$与米尔诺尔数的长度最多$k$消失,我们表明,米尔诺尔数$μ_c(I)$序列$I$是定义良好的最大共同devisor的$μ_{c}(J)'s$,其中$J$是一个子序列的$I$通过删除至少$k+1$指数。此外,如果$I$是长度为$2k+2$的非重复序列,则明确给出了$μ_c(I)$的可能范围。作为应用,我们给出了$4$ -三叶草链的边同伦分类。

英文摘要:

J.P. Levine introduced a clover link to investigate the indeterminacy of the Milnor invariants of a link. It is shown that for a clover link, the Milnor numbers of length at most $2k+1$ are well-defined if those of length at most $k$ vanish, and that the Milnor numbers of length at least $2k+2$ are not well-defined if those of length $k+1$ survive. For a clover link $c$ with the Milnor numbers of length at most $k$ vanishing, we show that the Milnor number $μ_c(I)$ for a sequence $I$ is well-defined up to the greatest common devisor of $μ_{c}(J)'s$, where $J$ is a subsequence of $I$ obtained by removing at least $k+1$ indices. Moreover, if $I$ is a non-repeated sequence with length $2k+2$, the possible range of $μ_c(I)$ is given explicitly. As an application, we give an edge-homotopy classification of $4$-clover links.

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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