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arXiv 2102.08425math.COmath.AG
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拟阵psi类

Matroid psi classes

Jeshu Dastidar, Dustin Ross

摘要:

受曲线模空间的相交理论的启发,在拟阵Chow环中引入了psi类,并证明了Losev-Manin空间Chow环中psi类的一些性质.利用拟阵psi类的这些性质,我们给出了拟阵约化特征多项式系数的Chow理论解释,拟阵体积多项式的显式公式,拟阵Chow环的Poincare对偶性的新证明.

英文摘要:

Motivated by the intersection theory of moduli spaces of curves, we introduce psi classes in matroid Chow rings and prove a number of properties that naturally generalize properties of psi classes in Chow rings of Losev-Manin spaces. We use these properties of matroid psi classes to give new proofs of (1) a Chow-theoretic interpretation for the coefficients of the reduced characteristic polynomials of matroids, (2) explicit formulas for the volume polynomials of matroids, and (3) Poincare duality for matroid Chow rings.

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