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arXiv math/0406279math.AGmath.CO
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复曲面剩余的组合构造

Combinatorial construction of toric residues

Amit Khetan, Ivan Soprounov

摘要:

复曲面剩余是一个依赖于n维完备复曲面簇上的n+1个半样本因子的映射。它出现在各种背景下,如稀疏多项式系统,镜像对称,和GKZ超几何函数。在本文中,我们研究的问题,找到一个明确的元素,其环面剩余等于一。这样的元素被证明存在当且仅当相关的多面体是必不可少的。我们减少问题找到一个集合的分区的格点在多面体满足一定的组合性质。我们使用这种描述来解决问题时,n=2和任何n时,多面体的除数共享一个完整的标志的脸。后者推广了早期的结果时,除数都是充足的。

英文摘要:

The toric residue is a map depending on n+1 semi-ample divisors on a complete toric variety of dimension n. It appears in a variety of contexts such as sparse polynomial systems, mirror symmetry, and GKZ hypergeometric functions. In this paper we investigate the problem of finding an explicit element whose toric residue is equal to one. Such an element is shown to exist if and only if the associated polytopes are essential. We reduce the problem to finding a collection of partitions of the lattice points in the polytopes satisfying a certain combinatorial property. We use this description to solve the problem when n=2 and for any n when the polytopes of the divisors share a complete flag of faces. The latter generalizes earlier results when the divisors were all ample.

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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