A linking invariant for algebraic curves

A linking invariant for algebraic curves
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代数曲线的链接不变量

DOI:
10.4171/lem/66-1/2-4
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发表时间:
2016
期刊:
L’Enseignement Mathématique
影响因子:
--
通讯作者:
Jean
Jean
中科院分区:
--
文献类型:
--
作者:
Benoit Guerville;Jean

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本文构造了代数平面曲线的一个拓扑不变量,它在某种意义上是纽结理论的连接数的一种改进。这个不变量是由第一作者Artal和Florens开发的线排列的I-不变量的推广。我们给出了两个实用的工具来计算这个不变量,使用通常的辫子单值性的修改或使用由Shirane介绍的连接数。作为一个应用程序,我们表明,这个不变量区分几个Zagliki对,即对曲线具有相同的组合,但不同的拓扑结构。前者是由Artal发现的著名的Zebraki对,由一个光滑的三次曲面组成,在其三个顶点处有3条切线。后者是由一个光滑的四次曲线和3个二重切线形成的。
We construct a topological invariant of algebraic plane curves, which is in some sense an adaptation of the linking number of knot theory. This invariant is shown to be a generalization of the I-invariant of line arrangements developed by the first author with Artal and Florens. We give two practical tools for computing this invariant, using a modification of the usual braid monodromy or using the connected numbers introduced by Shirane. As an application, we show that this invariant distinguishes several Zariski pairs, i.e. pairs of curves having same combinatorics, yet different topologies. The former is the well known Zariski pair found by Artal, composed of a smooth cubic with 3 tangent lines at its inflexion points. The latter is formed by a smooth quartic and 3 bitangents.
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DOI: --
发表时间: 2008
期刊:
影响因子: --
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