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arXiv 0709.1255math.AG
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代数幺半群的局部结构

Local structure of algebraic monoids

Michel Brion

摘要:

本文描述了不可约代数幺半群$M$在幂等元$e$处的局部结构。当$e$极小时,我们证明了$M$是核$MeM$(一个齐性空间)上的诱导簇,其纤维是双边稳定子$M_e$(一个具有零元和稠密单位群的连通仿射幺半群).当$M$是正规的时,这产生幂等元的稳定子和中心化子的不可约性,以及任意$M$的正规性和光滑性的准则。此外,我们还证明了$M$是阿贝尔簇的诱导簇,其中纤维是具有稠密单位群的连通仿射幺半群。

英文摘要:

We describe the local structure of an irreducible algebraic monoid $M$ at an idempotent element $e$. When $e$ is minimal, we show that $M$ is an induced variety over the kernel $MeM$ (a homogeneous space) with fibre the two-sided stabilizer $M_e$ (a connected affine monoid having a zero element and a dense unit group). This yields the irreducibility of stabilizers and centralizers of idempotents when $M$ is normal, and criteria for normality and smoothness of an arbitrary $M$. Also, we show that $M$ is an induced variety over an abelian variety, with fiber a connected affine monoid having a dense unit group.

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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