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arXiv math/0611904math.RTmath.CO
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根系子系统的分类

A classification of subsystems of a root system

Toshio Oshima

摘要:

我们将根系$Ξ$的同态分类为不改变Cartan整数的根系$Σ$。本文研究了由$Σ$的外尔群、$Ξ$的Weyl群以及$Σ$或$Ξ$的自同构等定义的几类同构类,并区分了由基本系统的子集生成的子系统。我们引入了根系对偶对的概念,这有助于研究$Ξ$的外自同构对同态的作用。

英文摘要:

We classify isomorphic classes of the homomorphisms of a root system $Ξ$ to a root system $Σ$ which do not change Cartan integers. We examine several types of isomorphic classes defined by the Weyl group of $Σ$, that of $Ξ$ and the automorphisms of $Σ$ or $Ξ$ etc. We also distinguish the subsystem generated by a subset of a fundamental system. We introduce the concept of the dual pair for root systems which helps to study the action of the outer automorphism of $Ξ$ on the homomorphisms.

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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