K-rings of wonderful varieties and matroids

K-rings of wonderful varieties and matroids
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奇妙品种和拟阵的 K 形环

DOI:
10.1016/j.aim.2024.109554
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发表时间:
2024
影响因子:
1.7
通讯作者:
Proudfoot, Nicholas
Proudfoot, Nicholas
中科院分区:
数学1区
文献类型:
--
作者:
Larson, Matt;Li, Shiyue;Payne, Sam;Proudfoot, Nicholas

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我们研究了超平面排列的奇妙变化的k环,并给出了仅依赖于底层矩阵的组合表示。我们用这种组合表示来定义任意无环矩阵的k环。我们构造了满足hirzebruch - riemann - roch型公式的矩阵的Chow环的一个整数系数的例外同构,推广了Berget, Eur, Spink和Tseng关于复面体变化(布尔排列的奇妙变化)的最近构造。作为应用,我们给出了奇异变种上任意线束的欧拉特性的组合公式。我们给出了增广奇异变型和带标记点的稳定有理曲线的Deligne-Mumford-Knudsen模空间的类似构造和结果。
We study theK-ring of the wonderful variety of a hyperplane arrangement and give a combinatorial presentation that depends only on the underlying matroid. We use this combinatorial presentation to define theK-ring of an arbitrary loopless matroid. We construct an exceptional isomorphism, with integer coefficients, to the Chow ring of the matroid that satisfies a Hirzebruch–Riemann–Roch-type formula, generalizing a recent construction of Berget, Eur, Spink, and Tseng for the permutohedral variety (the wonderful variety of a Boolean arrangement). As an application, we give combinatorial formulas for Euler characteristics of arbitrary line bundles on wonderful varieties. We give analogous constructions and results for augmented wonderful varieties, and for Deligne–Mumford–Knudsen moduli spaces of stable rational curves with marked points.
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