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arXiv math/0005098math.AGmath.ACmath.CV
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光滑簇上的一致界和符号幂

Uniform Bounds and Symbolic Powers on Smooth Varieties

Lawrence Ein, Robert Lazarsfeld, Karen E. Smith

摘要:

我们展示了如何乘子理想可以用来获得一致的乘法界的某些家庭的理想光滑复代数簇。特别是,我们证明了一个快速,但相当令人惊讶的结果,象征权力的激进的理想在这样的品种。具体地说,设I是一个光滑簇X上的根理想层,定义了X的一个约化子概型Z,并假设Z的每一个不可约分支在X中至多有余维数e。给定一个整数m > 0,设f是一个函数芽,在Z的每个不可约分支的一个通点处至少e.m阶为零。那么事实上f是I的m次方I^m。

英文摘要:

We show how multiplier ideals can be used to obtain uniform multiplicative bounds for certain families of ideals on a smooth complex algebraic variety. In particular we prove a quick but rather surprising result about symbolic powers of radical ideals on such a variety. Specifically, let I be a radical ideal sheaf on a smooth variety X defining a reduced subscheme Z of X and suppose that every irreducible component of Z has codimension at most e in X. Given an integer m > 0 suppose that f is a function germ that vanishes to order at least e.m at a general point of each irreducible component of Z . Then in fact f lies in the m-th power I^m of I.

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