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arXiv math/0310103math.COmath.AG
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Grassmannians上的Root游戏

Root games on Grassmannians

Kevin Purbhoo

摘要:

我们回顾根游戏,介绍了在较早的文件,这给了一个相当强大的充分条件非零的舒伯特演算的广义旗流形G/B。我们证明了它给出了Schubert演算在Grassmannian上不为零的一个充分必要规则。特别是,一个Littlewood-Richardson数是非零的,当且仅当它有可能赢得相应的根博弈。更一般地说,该规则可以用来确定Gr_l(n)上的几个Schubert类的乘积是否以明显对称的方式非零。最后,我们给出了格拉斯曼Schubert问题根对策的几何解释。

英文摘要:

We recall the root game, introduced in an earlier paper, which gives a fairly powerful sufficient condition for non-vanishing of Schubert calculus on a generalised flag manifold G/B. We show that it gives a necessary and sufficient rule for non-vanishing of Schubert calculus on Grassmannians. In particular, a Littlewood-Richardson number is non-zero if and only if it is possible to win the corresponding root game. More generally, the rule can be used to determine whether or not a product of several Schubert classes on Gr_l(n) is non-zero in a manifestly symmetric way. Finally, we give a geometric interpretation of root games for Grassmannian Schubert problems.

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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