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arXiv 1303.6478math.AGmath.CO
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曲线的热带覆盖及其模空间

Tropical covers of curves and their moduli spaces

Arne Buchholz, Hannah Markwig

摘要:

我们定义了平面上热带线覆盖的热带模空间为加权抽象多面体复形,热带分支映射记录了简单分支的图像。我们的主要结果是分支映射的度的不变性,这使我们能够给出热带三重Hurwitz数的热带交理论定义。我们表明,我们的相交理论的定义与Bertrand,Brugallé和Mikhalkin在文章中给出的一致“热带开放Hurwitz数”,其中一个对应定理证明了Hurwitz数。因此,我们提供了一个热带交叉理论的理由与热带覆盖的多重性。我们的证明方法是在我们的热带模空间和某些相对稳定映射到射影线的模空间之间建立一个局部对偶。

英文摘要:

We define the tropical moduli space of covers of a tropical line in the plane as weighted abstract polyhedral complex, and the tropical branch map recording the images of the simple ramifications. Our main result is the invariance of the degree of the branch map, which enables us to give a tropical intersection-theoretic definition of tropical triple Hurwitz numbers. We show that our intersection-theoretic definition coincides with the one given by Bertrand, Brugallé and Mikhalkin in the article "Tropical Open Hurwitz numbers" where a Correspondence Theorem for Hurwitz numbers is proved. Thus we provide a tropical intersection-theoretic justification for the multiplicities with which a tropical cover has to be counted. Our method of proof is to establish a local duality between our tropical moduli spaces and certain moduli spaces of relative stable maps to the projective line.

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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