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arXiv 0911.0286math.NTmath.AG
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奥津不变量与牛顿多边形

Okutsu invariants and Newton polygons

Jordi Guardia, Jesus Montes, Enric Nart

摘要:

设K是特征为零的局部域,O是其整数环,F(x)是系数在O中的一元不可约多项式。K. Okutsu附加到F(x)的某些本原因子多项式F_1(x),.,F_r(x),它们在次数上特别接近F(x)。本文刻画了Okutsu族[F_1,…,F_r]中的某些高阶牛顿多边形,我们得到了一些应用:某些奥津不变量的闭公式,新的奥津不变量的发现,或F(x)的Montes逼近的构造;这些是monic不可约多项式,足够接近F(x),以共享它的所有奥津不变量。这一观点拓宽了Montes算法的应用范围,它可以被重新解释为计算O[x]中一元可分多项式f(x)的每个不可约因子的Okutsu多项式和Montes逼近的工具。

英文摘要:

Let K be a local field of characteristic zero, O its ring of integers and F(x) a monic irreducible polynomial with coefficients in O. K. Okutsu attached to F(x) certain primitive divisor polynomials F_1(x),..., F_r(x), that are specially close to F(x) with respect to their degree. In this paper we characterize the Okutsu families [F_1,..., F_r] in terms of certain Newton polygons of higher order, and we derive some applications: closed formulas for certain Okutsu invariants, the discovery of new Okutsu invariants, or the construction of Montes approximations to F(x); these are monic irreducible polynomials sufficiently close to F(x) to share all its Okutsu invariants. This perspective widens the scope of applications of Montes' algorithm, which can be reinterpreted as a tool to compute the Okutsu polynomials and a Montes approximation, for each irreducible factor of a monic separable polynomial f(x) in O[x].

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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