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arXiv 0708.2268math.AG
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热带扇与热带曲线的模空间

Tropical fans and the moduli spaces of tropical curves

Andreas Gathmann, Michael Kerber, Hannah Markwig

摘要:

我们给出了一个严格的定义的热带球迷(“当地积木的热带品种”)和他们的态射。对于这样一个态射的热带风扇的相同尺寸,我们表明,逆像的数量(计算与适当的热带多重性)的一个点在目标上不依赖于所选择的点-一个声明,可以被视为开始的热带相交理论。作为一个应用,我们考虑有理热带曲线(抽象的和在某些R^r)的模空间与评价和遗忘态射。利用我们的结果,这给出了各种热带独立性陈述的新的、简单的和统一的证明,例如,通过给定点的有理热带曲线的数目(在任何R^r中)与点无关的事实。

英文摘要:

We give a rigorous definition of tropical fans (the "local building blocks for tropical varieties") and their morphisms. For such a morphism of tropical fans of the same dimension we show that the number of inverse images (counted with suitable tropical multiplicities) of a point in the target does not depend on the chosen point - a statement that can be viewed as the beginning of a tropical intersection theory. As an application we consider the moduli spaces of rational tropical curves (both abstract and in some R^r) together with the evaluation and forgetful morphisms. Using our results this gives new, easy, and unified proofs of various tropical independence statements, e.g. of the fact that the numbers of rational tropical curves (in any R^r) through given points are independent of the points.

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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