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arXiv math/0311390math.COmath.AG
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颤动系数是舒伯特结构常数

Quiver coefficients are Schubert structure constants

Anders Skovsted Buch, Frank Sottile, Alexander Yong

摘要:

我们给出了一个明确的自然识别之间的Buch和Fulton,分解系数的Schubert多项式,和Schubert结构常数旗流形。这也是在K理论中实现的,其中我们给出了一个直接的论点,即分解系数具有交替符号,基于Brion定理,这意味着分解系数具有交替符号。我们的鉴定表明,已知的组合公式为后两个数字给出的公式的系数。

英文摘要:

We give an explicit natural identification between the quiver coefficients of Buch and Fulton, decomposition coefficients for Schubert polynomials, and the Schubert structure constants for flag manifolds. This is also achieved in K-theory where we give a direct argument that the decomposition coefficients have alternating signs, based on a theorem of Brion, which then implies that the quiver coefficients have alternating signs. Our identification shows that known combinatorial formulas for the latter two numbers give formulas for the quiver coefficients.

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