arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.02698math.RTmath.AGmath.CO
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双旗簇的轨道嵌入与Steinberg映射

Orbit embedding for double flag varieties and Steinberg map

Lucas Fresse, Kyo Nishiyama

摘要:

在本文的前半部分,我们回顾了对称对的双旗簇的Steinberg理论。对于AIII型对称空间的特殊情况,我们将考虑$ K = GL_n \times GL_n $对角作用于其上的$ X = GL_{2n}/P_{(n,n)} \times GL_n / B_n^+ \times GL_n / B_n^- $。我们给出了$ X $中的$ K $ -轨道的分类,并给出了Steinberg映射的显式组合描述。在后半部分,我们发展了双旗簇嵌入到更大的双旗簇的理论。这种嵌入是一个强有力的工具,以研究不同类型的双旗品种在已知的。我们证明了轨道的嵌入定理的充分一般性,并给出了一个例子,CI型嵌入到AIII型。

英文摘要:

In the first half of this article, we review the Steinberg theory for double flag varieties for symmetric pairs. For a special case of the symmetric space of type AIII, we will consider $ X = GL_{2n}/P_{(n,n)} \times GL_n / B_n^+ \times GL_n / B_n^- $ on which $ K = GL_n \times GL_n $ acts diagonally. We give a classification of $ K $-orbits in $ X $, and explicit combinatorial description of the Steinberg maps. In the latter half, we develop the theory of embedding of a double flag variety into a larger one. This embedding is a powerful tool to study different types of double flag varieties in terms of the known ones. We prove an embedding theorem of orbits in full generality and give an example of type CI which is embedded into type AIII.

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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