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arXiv 1607.04860math.AGmath.CV
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交重数、米尔诺数和伯恩斯坦定理

Intersection multiplicity, Milnor number and Bernstein's theorem

Pinaki Mondal

摘要:

我们明确地描述了当多项式或幂级数(在任意特征的代数闭域k上)的原点处的Milnor数是具有相同牛顿图的所有多项式中的最小值时,这完成了Kushnirenko(Invent.数学、1976)和Wall(J. Reine Angew.数学,1999年)。给定R^n中n个凸积分多面体的固定集合,我们也给出了在这些多面体上支持的n个多项式的系统的显式特征,这些多面体在k^n上或更一般地在k^n上的环面轨道的并集上具有最大数量的孤立零(以多重数计算);这完成了程序(由许多作者承担,包括Khovanskii(Funkcional. Anal. i Prilozen,1978)、Huber和Sturmfels(Discrete Comput. Geom.,1997),Rojas(J. Pure Appl. Algebra,1999))的Bernstein定理(Funkcional. Anal. i Prilozen,1975)关于(k^*)^n上n个多项式的解的个数。我们对这两个问题的解决是通过计算由n个一般多项式确定的n个超曲面在原点处的交重数来连接的。

英文摘要:

We explicitly characterize when the Milnor number at the origin of a polynomial or power series (over an algebraically closed field k of arbitrary characteristic) is the minimum of all polynomials with the same Newton diagram, which completes works of Kushnirenko (Invent. Math., 1976) and Wall (J. Reine Angew. Math., 1999). Given a fixed collection of n convex integral polytopes in R^n, we also give an explicit characterization of systems of n polynomials supported at these polytopes which have the maximum number (counted with multiplicity) of isolated zeroes on k^n, or more generally, on a union of torus orbits on k^n; this completes the program (undertaken by many authors including Khovanskii (Funkcional. Anal. i Prilozen, 1978), Huber and Sturmfels (Discrete Comput. Geom., 1997), Rojas (J. Pure Appl. Algebra, 1999)) of the extension to k^n of Bernstein's theorem (Funkcional. Anal. i Prilozen, 1975) on number of solutions of n polynomials on (k^*)^n. Our solutions to these two problems are connected by the computation of the intersection multiplicity at the origin of n hypersurfaces determined by n generic polynomials.

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