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arXiv math/0412139math.GT
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关于环面链节的壳数

On the hull numbers of torus links

Ivan Izmestiev

摘要:

R^3中曲线并的第n个外壳是具有以下性质的点集:任何通过该点的平面与曲线相交至少2n次。链路L的外壳数u(L)被定义为L的代表可以具有的非空外壳的最小数量。我们表明,环面链接的船体数量是小于预期的,但仍然很大。特别地,对于类型(p,p)的链路,壳数等于3 p/5,并且通常对于q>p的类型(p,q),壳数大于或等于p/2。

英文摘要:

The n-th hull of a union of curves in R^3 is the set of points with the property: Any plane passing through the point intersects the curves at least 2n times. The hull number u(L) of a link L is defined as the minimum number of non-empty hulls a representative of L can have. We show that the hull numbers of torus links are smaller than expected, but still large. In particular, for a link of type (p,p) hull number equals 3p/5, and in general for the type (p,q) with q>p it is greater than or equal to p/2.

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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