Irreducible Cycles and Points in Special Position in Moduli Spaces for Tropical Curves

Irreducible Cycles and Points in Special Position in Moduli Spaces for Tropical Curves
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热带曲线模空间中的不可约环和特殊位置点

DOI:
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发表时间:
2011
影响因子:
0.7
通讯作者:
Franziska Schroeter
Franziska Schroeter
中科院分区:
数学4区
文献类型:
--
作者:
A. Gathmann;Franziska Schroeter

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在本文的第一部分,我们讨论了 n 标记有理热带曲线模空间中循环的不可约性概念。我们证明了 Psi 类和重要因子是不可约的,并且局部不可约因子对于 n leq 6 也是全局不可约的。在论文的第二部分中,我们证明了在计算有理平面曲线(以两种不同方式定义)的特殊位置上的 (R^2)^n 中的点配置轨迹可以给定一个余维为 1 的热带循环结构。此外,我们显式地计算了该循环的权重。
In the first part of this paper, we discuss the notion of irreducibility of cycles in the moduli spaces of n-marked rational tropical curves. We prove that Psi-classes and vital divisors are irreducible, and that locally irreducible divisors are also globally irreducible for n leq 6. In the second part of the paper, we show that the locus of point configurations in (R^2)^n in special position for counting rational plane curves (defined in two different ways) can be given the structure a tropical cycle of codimension 1. In addition, we compute explicitly the weights of this cycle.