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arXiv math/0501329math.AGmath.RT
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$gl\_n$的约化类

Varieties of reductions for $gl\_n$

Atanas Iliev, Laurent Manivel

摘要:

研究了$\fgl\_n$中秩一矩阵的各种约简。这些变种被定义为将单位矩阵写成秩为1的$n$矩阵的和的不同方式的自然紧化。等价地,它们通过一个极大环面的正规化子紧化了$PGL\_n$的商。特别是,我们证明了$n=4$,我们得到一个12维的Fano品种皮卡德数1,指数3,和典型的奇点。

英文摘要:

We study the varieties of reductions associated to the variety of rank one matrices in $\fgl\_n$. These varieties are defined as natural compactifications of the different ways to write the identity matrix as a sum of $n$ rank one matrices. Equivalently, they compactify the quotient of $PGL\_n$ by the normalizer of a maximal torus. In particular, we prove that for $n=4$ we get a 12-dimensional Fano variety with Picard number one, index 3, and canonical singularities.

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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