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arXiv math/9908106math.AG
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间隙滑轮和Vogel循环

Gap Sheaves and Vogel Cycles

David B. Massey

摘要:

在我们对仿射超曲面奇点的Lê圈的研究中,我们的主要代数工具包括一种方法,用于取复解析函数的雅可比理想,并将其分解为纯维“块”。这些块是通过考虑Lê和Teissier的相对极簇作为间隙层而得到的。间隙层是一种形式化的手段,它赋予初始概型与解析集之差的解析闭包以概型论的意义。我们想把我们在黎圈上的结果推广到任意复解析空间上的函数,因此我们推广了这种代数方法。我们从一个理想的生成元的有序集合开始,并产生一个纯维解析循环的集合,即Vogel循环,它似乎包含了大量与原始理想有关的“几何”数据。我们证明了一些有用的结果,包括一些非常普遍的Lê-Iomdine-Vogel公式,这些公式推广了Lê Iomdine公式,我们在以前的工作中使用,所以有益的。

英文摘要:

Throughout our work on the Lê cycles of an affine hypersurface singularity, our primary algebraic tool consisted of a method for taking the Jacobian ideal of a complex analytic function and decomposing it into pure-dimensional "pieces". These pieces were obtained by considering the relative polar varieties of Lê and Teissier as gap sheaves. A gap sheaf is a formal device which gives a scheme-theoretic meaning to the analytic closure of the difference of an initial scheme and an analytic set. We would like to extend our results on Lê cycles to functions on an arbitrary complex analytic space, and so we generalize this algebraic approach. We begin with an ordered set of generators for an ideal, and produce a collection of pure-dimensional analytic cycles, the Vogel cycles, which seem to contain a great deal of ``geometric'' data related to the original ideal. We prove a number of useful results, including some extremely general Lê-Iomdine-Vogel formulas; these formulas generalize the Lê Iomdine formulas that we used so profitably in previous work.

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