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arXiv 0909.2289math.RT
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改进的Dynkin图和Weyl轨道

Enhanced Dynkin diagrams and Weyl orbits

Eugene Dynkin, Andrei Minchenko

摘要:

复半单李代数的根系R由它的基(也称为单根)唯一确定。人们自然会问,是否所有根系的同态都来自它们的基的同态。由于R的Dynkin图一般不足以包含R的所有子系统的图,所以这个问题的答案是否定的。在本文中,我们介绍了一个典型的扩大的基础(称为增强的基础),其中所述的问题有一个肯定的答案。我们使用增强的Dynkin图的名称来表示增强的基础。这些图与其他新工具(mosets,核心组)相结合,允许获得一个透明的图片之间的自然偏序外尔轨道的子系统在R。在本文中,我们只考虑ADE根系(即,由简单的花边Dynkin图表示的系统)。一般情况将是下一次出版物的主题。

英文摘要:

The root system R of a complex semisimple Lie algebra is uniquely determined by its basis (also called a simple root system). It is natural to ask whether all homomorphisms of root systems come from homomorphisms of their bases. Since the Dynkin diagram of R is, in general, not large enough to contain the diagrams of all subsystems of R, the answer to this question is negative. In this paper we introduce a canonical enlargement of a basis (called an enhanced basis) for which the stated question has a positive answer. We use the name an enhanced Dynkin diagram for a diagram representing an enhanced basis. These diagrams in combination with other new tools (mosets, core groups) allow to obtain a transparent picture of the natural partial order between Weyl orbits of subsystems in R. In this paper we consider only ADE root systems (that is, systems represented by simply laced Dynkin diagrams). The general case will be the subject of the next publication.

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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