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arXiv math/0006232math.AG
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关于幂零轨道方程的两个结果

Two results on equations of nilpotent orbits

J. Weyman

摘要:

我们证明了两个结果的定义理想的某些品种的矩阵。让我们确定两个正整数r,e。设M(r)是域K上r × r矩阵的集合.考虑K上M(r)的幂零簇的闭子概形,其定义条件为char_A(T)=T^r,A^e=0.我们证明了当K的特征为零时,该方案是约化的。此外,对于e=2,我们证明了该计划是减少在一个域K的任意特征。这些结果是由G. Pappas和M. Rapoport(比较他们的论文“分支情况下的局部模型I。EL-情况”,数学AG/0006222),并给出他们的一些解释的答案。

英文摘要:

We prove two results on the defining ideals of certain varieties of matrices. Let us fix two positive integers r, e. Let M(r) be the set of r x r matrices over a field K. We consider the closed subscheme of the nilpotent variety of M(r) over K defined by the conditions char_A(T)=T^r, A^e=0. We prove that when the characteristic of K is zero this scheme is reduced. Also for e=2 we prove that this scheme is reduced over a field K of arbitrary characteristic. These results were motivated by the questions of G. Pappas and M. Rapoport (compare their paper ''Local models in the ramified case I. The EL-case", math.AG/0006222) and give answers to some of their conjectures.

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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