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arXiv 2006.03516math.RTmath.GR
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关于实球面空间的小外尔群

On the little Weyl group of a real spherical space

Job J. Kuit, Eitan Sayag

摘要:

本文进一步研究了实球齐性空间$Z=G/H$的压缩锥。特别地,我们给出了Knop和Krötz最近引入的$Z$的小外尔群的尺规作图法.我们的技术是基于一个精细的分析的极限共轭的子代数$\mathrm{Lie}(H)$沿单参数子群的格拉斯曼的$\mathrm{Lie}(G)$的子空间。小外尔群是由压缩锥壁的反射产生的有限反射群。

英文摘要:

In the present paper we further the study of the compression cone of a real spherical homogeneous space $Z=G/H$. In particular we provide a geometric construction of the little Weyl group of $Z$ introduced recently by Knop and Krötz. Our technique is based on a fine analysis of limits of conjugates of the subalgebra $\mathrm{Lie}(H)$ along one-parameter subgroups in the Grassmannian of subspaces of $\mathrm{Lie}(G)$. The little Weyl group is obtained as a finite reflection group generated by the reflections in the walls of the compression cone.

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