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arXiv 1102.3736math.GT
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某些$T^2$ -环的三重环绕数和三重点数

Triple linking numbers and triple point numbers of certain $T^2$-links

Inasa Nakamura

摘要:

定义了定向曲面链环的三重环绕数,它是经典链环的环绕数的类比概念。我们考虑由两个可交换的纯$m$ -辫子$a$和$b$确定的某种$m$ -分量$T^2$ -链接($m \geq 3$).利用$b$和$a$闭包的环绕数,给出了这类$T^2$环的三环数.这给出了三重点数的下界。在某些情况下,我们可以确定三重点数,每个都是四的倍数。

英文摘要:

The triple linking number of an oriented surface link was defined as an analogical notion of the linking number of a classical link. We consider a certain $m$-component $T^2$-link ($m \geq 3$) determined from two commutative pure $m$-braids $a$ and $b$. We present the triple linking number of such a $T^2$-link, by using the linking numbers of the closures of $a$ and $b$. This gives a lower bound of the triple point number. In some cases, we can determine the triple point numbers, each of which is a multiple of four.

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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