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arXiv 1401.3073math.AGmath.COmath.RT
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辛Grassmannian算子的Pfweian求和公式

Pfaffian sum formula for the symplectic Grassmannians

Takeshi Ikeda, Tomoo Matsumura

摘要:

研究辛向量空间中非极大迷向子空间的格拉斯曼环面等变Schubert类。我们证明了一个公式,表示这些类中的每一个作为一个和多个Schur-Pfrongans,其条目是equivariantly修改特殊舒伯特类。我们的结果证明了Wilson的上同调公式,推广了Buch-Kresch-Tamvakis用Young提升算子给出的Giambelli上同调公式.此外,我们表明,该公式推广到某一家庭的Schubert类的辛部分各向同性旗品种。

英文摘要:

We study the torus equivariant Schubert classes of the Grassmannian of non-maximal isotropic subspaces in a symplectic vector space. We prove a formula that expresses each of those classes as a sum of multi Schur-Pfaffians, whose entries are equivariantly modified special Schubert classes. Our result gives a proof to Wilson's conjectural formula, which generalizes the Giambelli formula for the ordinary cohomology proved by Buch-Kresch-Tamvakis, given in terms of Young's raising operators. Furthermore we show that the formula extends to a certain family of Schubert classes of the symplectic partial isotropic flag varieties.

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