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arXiv math/0209043math.AG
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奇异点和临界点的解析阶

Analytic order of singular and critical points

Eugenii Shustin

摘要:

我们处理以下密切相关的问题:(i)对于一个约化平面解析曲线的芽,什么是一个代数曲线的最小程度与一个奇点解析等价(同构)给一个?(ii)对于一个二元全纯函数的芽,它有一个孤立的临界点,在一个局部全纯坐标变换下,与给定函数等价的多项式的最小次数是多少?在这些问题中,对这种程度$d$的经典已知估计是$\sqrtμ+1\le d\le μ+1$,其中$μ$是米尔诺尔数。我们在这两个问题中的结果是具有绝对常数$a$的$d\le a\sqrtμ$。作为推论,我们得到了光滑代数曲面上具有指定奇异性的代数曲线存在的渐近适当的充分条件。

英文摘要:

We deal with the following closely related problems: (i) For a germ of a reduced plane analytic curve, what is the minimal degree of an algebraic curve with a singular point analytically equivalent (isomorphic) to the given one? (ii) For a germ of a holomorphic function in two variables with an isolated critical point, what is the minimal degree of a polynomial, equivalent to the given function up to a local holomorphic coordinate change? Classically known estimates for such a degree $d$ in these questions are $\sqrtμ+1\le d\le μ+1$, where $μ$ is the Milnor number. Our result in both the problems is $d\le a\sqrtμ$ with an absolute constant $a$. As a corollary, we obtain asymptotically proper sufficient conditions for the existence of algebraic curves with prescribed singularities on smooth algebraic surfaces.

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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