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arXiv 0812.1343math.AGmath.RT
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极大幂幺子群的导群在$G$ -簇上的作用

Actions of the derived group of a maximal unipotent subgroup on $G$-varieties

Dmitri I. Panyushev

摘要:

设$U$是连通半单群$G$的极大幂幺子群,$U'$是$U$的导群.研究了$U'$在仿射$G$ -簇上的作用.首先,我们考虑$G/U$上的$U'$不变量的代数。证明了$k[G/U]^{U'}$是Krull维数$2r$的多项式代数,其中$r=rk(G)$ .一个相关的结果是,对于任何简单的有限维$G$ -模$V$,$V^{U'}$是循环的$U/U'$ -模。其次,我们研究了仿射锥$G$ -簇上$U'$ -不变量的Poincare级数的“对称性”。第三,我们获得了具有$U'$ -不变量的多项式代数的简单$G$ -模块$V$的分类(对于$G$简单)。

英文摘要:

Let $U$ be a maximal unipotent subgroup of a connected semisimple group $G$ and $U'$ the derived group of $U$. We study actions of $U'$ on affine $G$-varieties. First, we consider the algebra of $U'$ invariants on $G/U$. We prove that $k[G/U]^{U'}$ is a polynomial algebra of Krull dimension $2r$, where $r=rk(G)$. A related result is that, for any simple finite-dimensional $G$-module $V$, $V^{U'}$ is a cyclic $U/U'$-module. Second, we study "symmetries" of Poincare series for $U'$-invariants on affine conical $G$-varieties. Third, we obtain a classification of simple $G$-modules $V$ with polynomial algebras of $U'$-invariants (for $G$ simple).

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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