arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0904.4493math.RTmath.CO
收藏

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

William M. McGovern, Peter E. Trapa

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.

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。

↑