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arXiv 1104.0320math.AGmath.NT
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曲线上的非阿基米德几何、热带化和度量

Nonarchimedean geometry, tropicalization, and metrics on curves

Matthew Baker, Sam Payne, Joseph Rabinoff

摘要:

我们开发了一些通用的技术比较分析和热带化的代数簇。我们的基本结果包括热带多重性的投影公式和推广的Sturmfels-Tevelev多重性公式在热带消除理论的情况下,一个非平凡的估值。对于曲线,我们详细探讨了骨架度量和晶格长度的tropicalizations之间的关系,并表明,从曲线的解析其环面嵌入的tropicalizations稳定的映射到有限子图的等距。其他应用包括推广施派尔的井spacedness条件和卡茨-Markwig-Markwig结果热带j-不变量。

英文摘要:

We develop a number of general techniques for comparing analytifications and tropicalizations of algebraic varieties. Our basic results include a projection formula for tropical multiplicities and a generalization of the Sturmfels-Tevelev multiplicity formula in tropical elimination theory to the case of a nontrivial valuation. For curves, we explore in detail the relationship between skeletal metrics and lattice lengths on tropicalizations and show that the maps from the analytification of a curve to the tropicalizations of its toric embeddings stabilize to an isometry on finite subgraphs. Other applications include generalizations of Speyer's well-spacedness condition and the Katz-Markwig-Markwig results on tropical j-invariants.

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