Simplicial generation of Chow rings of matroids
Simplicial generation of Chow rings of matroids
复制标题
拟阵 Chow 环的单纯生成
DOI:
10.4171/jems/1350
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发表时间:
2019
影响因子:
2.6
通讯作者:
Connor Simpson
中科院分区:
文献类型:
--
作者:
Spencer Backman;C. Eur;Connor Simpson
We introduce a new presentation of the Chow ring of a matroid whose variables now admit a combinatorial interpretation via the theory of matroid quotients and display a geometric behavior analogous to that of nef classes on smooth projective varieties. We apply these properties to produce a bijection between a standard monomial basis of our presentation and a relative generalization of Schubert matroids. As a corollary we obtain the Poincare duality property for Chow rings of matroids. We then give a formula for the volume polynomial with respect to our presentation and show that it is log-concave in the positive orthant. We recover the portion of the Hodge theory of matroids in [AHK18] which implies the Heron-Rota-Welsh conjecture on the log-concavity of the coefficients of the characteristic polynomial. We emphasize that our work eschews the use of flipping, which is the key technical tool employed in [AHK18]. Thus our proof does not leave the realm of matroids.
DOI:
10.4310/cdm.2016.v2016.n1.a1
发表时间:
2016
期刊:
Current Developments in Mathematics
影响因子:
--
作者:
Huh, June
通讯作者:
Huh, June
影响因子:
4.9
作者:
Adiprasito, Karim;Huh, June;Katz, Eric
通讯作者:
Katz, Eric