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arXiv math/0604290math.AGmath.CO
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次级扇的热带不变量

Tropical Invariants from the Secondary Fan

Eric Katz

摘要:

本文研究了特殊组合类型的热带平面曲线通过一定数量的泛点的加权计数问题。我们给出了一个准则,来自热带相交理论上的二次扇,为一个加权计数给出了一个数不变的位置的点。通过计算一定的交重数,我们展示了Mikhalkin的方法来计算Gromov-Witten不变量适合我们的方法。这开始解决一个由狄更斯,Feichtner和Sturmfels提出的问题。我们还给出了一个几何的解释,我们生产的数字涉及Chow contients,并提供了一个反例表明,热带塞维品种并不总是支持二次风扇。本文是对预印本《次级扇中锥体的热带度》的修订。"

英文摘要:

In this paper, we consider weighted counts of tropical plane curves of particular combinatorial type through a certain number of generic points. We give a criterion, derived from tropical intersection theory on the secondary fan, for a weighted count to give a number invariant of the position of the points. By computing a certain intersection multiplicity, we show how Mikhalkin's approach to computing Gromov-Witten invariants fits into our approach. This begins to address a question raised by Dickenstein, Feichtner, and Sturmfels. We also give a geometric interpretation of the numbers we produce involving Chow quotients, and provide a counterexample showing that the tropical Severi variety is not always supported on the secondary fan. This paper is a revision of the preprint, "The Tropical Degree of Cones in the Secondary Fan."

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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