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arXiv 2204.04556math.AGmath.ACmath.RA
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关于GKZ判别 locus

On the GKZ discriminant locus

Université Libre de Bruxelles(布鲁塞尔自由大学);Universiteit Hasselt(哈瑟尔特大学);Vrije Universiteit Brussel(布鲁塞尔自由大学)

Špela Špenko, Michel Van den Bergh

AI总结:

本文证明GKZ判别 locus 是所有判别 locus 的直接并集,无需取闭包,回答了Kite和Segal的问题。

摘要:

令A为一个整数矩阵,P为其列的凸包。根据Gelfand、Kapranov和Zelevinski的结果,所谓的主A-行列式 locus 等于P的各个面所对应的Laurent多项式的判别 locus 的闭包的并集。在本短注中,我们证明它也是所有判别 locus 的直接并集,即可以包含更高维的判别 locus,无需取闭包。这回答了Kite和Segal提出的问题。

英文摘要:

Let $A$ be an integral matrix and let $P$ be the convex hull of its columns. By a result of Gelfand, Kapranov and Zelevinski, the so-called principal $A$-determinant locus is equal to the union of the closures of the discriminant loci of the Laurent polynomials associated to the faces of $P$ that are hypersurfaces. In this short note we show that it is also the straightforward union of all the discriminant loci, i.e. we may include those of higher codimension, and there is no need to take closures. This answers a question by Kite and Segal.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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