旗簇中对称子群轨道的模式避免和闭包的光滑性
Pattern avoidance and smoothness of closures for orbits of a symmetric subgroup in the flag variety
摘要:
本文给出了一个模式回避准则来分类Sp(p,C)x Sp(q,C)(分别为. GL(n,C))对类型为C_{p+q}的标志种类(分别为D_n)的有理光滑闭包。我们表明,所有这样的轨道关闭纤维(光滑纤维)在一个较小的旗帜品种,因此,实际上是顺利的。此外,我们证明了分类是不敏感的iscrystal。
英文摘要:
We give a pattern avoidance criterion to classify the orbits of Sp(p,C) x Sp(q,C) (resp. GL(n,C)) on the flag variety of type C_{p+q} (resp. D_n) with rationally smooth closure. We show that all such orbit closures fiber (with smooth fiber) over a smaller flag variety, and hence are in fact smooth. In addition we prove that the classification is insensitive to isogeny.
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