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arXiv 0901.1389math.COmath.AG
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图与热带曲线的Torelli定理

Torelli theorem for graphs and tropical curves

Lucia Caporaso, Filippo Viviani

摘要:

代数曲线在有限图中有一个离散的类似物。追求这个类比,我们证明了图的Torelli定理。也就是说,我们证明了两个图具有相同的Albanese环面当且仅当由它们通过收缩所有分离边得到的图是2-同构的。特别地,强Torelli定理对3-连通图成立。其次,利用紧热带曲线与度量图的对应关系,证明了一个热带Torelli定理,给出了两条热带曲线具有相同的主极化热带Jacobian的充要条件.最后,我们描述了一些自然偏序集与一个图,并证明了它们的特征是它的Delaunay分解。

英文摘要:

Algebraic curves have a discrete analogue in finite graphs. Pursuing this analogy we prove a Torelli theorem for graphs. Namely, we show that two graphs have the same Albanese torus if and only if the graphs obtained from them by contracting all separating edges are 2-isomorphic. In particular, the strong Torelli theorem holds for 3-connected graphs. Next, using the correspondence between compact tropical curves and metric graphs, we prove a tropical Torelli theorem giving necessary and sufficient conditions for two tropical curves to have the same principally polarized tropical Jacobian. Finally we describe some natural posets associated to a graph and prove that they characterize its Delaunay decomposition.

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