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单词 Linking number
释义

Linking number

原声例句
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Facebook promised the European commission then that it would not link phone numbers to Facebook identities, but it broke the promise almost as soon as the deal went through.

脸书曾向欧盟委员会承诺,不会将手机号码与脸书账户进行绑定,不过在该笔交易达成后,这一承诺几乎立即变成了空头支票。

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To many, the number six has long been associated with evil, with the number 666 often being referred to as the number of the beast and being directly linked to the devil himself.

对许多人来说, 数字 6 长期以来一直与邪恶联系在一起,数字 666 通常被称为野兽的数字, 并与魔鬼本身直接相关。

中文百科

环绕数

这样 (2,4)-环面链环的两条曲线的环绕数是 4。
六个正交叉与两个负交叉,这两条曲线的环绕数为 2。
怀特黑德链环两条曲线环绕数为零。

在数学中,环绕数linking number)是描述三维空间中两条闭曲线环绕的一个数值不变量。直观上,环绕数表示每一条曲线缠绕另一条曲线的次数。环绕数总是整数,但有可能取正数或负数,取决于这两条曲线的定向。

环绕数由高斯以环绕积分的形式引入。它在纽结理论、代数拓扑和微分几何的研究中是重要的对象,并在数学和科学中有许多应用,包括量子力学、电磁学以及 DNA超螺旋的研究。

英语百科

Linking number 环绕数

The two curves of this (2,8)-torus link have linking number four.
With six positive crossings and two negative crossings, these curves have linking number two.
The two curves of the Whitehead link have linking number zero.
The Milnor invariants generalize linking number to links with three or more components, allowing one prove that the Borromean rings are linked, though any two components have linking number 0.

In mathematics, the linking number is a numerical invariant that describes the linking of two closed curves in three-dimensional space. Intuitively, the linking number represents the number of times that each curve winds around the other. The linking number is always an integer, but may be positive or negative depending on the orientation of the two curves.

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更新时间:2025/6/17 19:25:39