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arXiv 1104.0407math.AGmath.DG
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无穷远X簇

Cluster X-varieties at infinity

V. V. Fock, A. B. Goncharov

摘要:

正空间是具有正图集的空间,即具有无减法转移函数的有理坐标系的集合。正空间的正实点集定义良好。我们定义了后者的热带紧化。我们证明了它推广了Teichmuller空间的Thurston紧化。正空间的热带边界是具有分段线性结构的球面。簇X-簇是一类特殊类型的正空间。我们定义了簇X-簇的特殊完备化。他们有一个分层,其层是(仿射闭包)集群X品种。在完备化过程中,原坐标环面扩展到坐标仿射空间。我们定义的Teichmuller空间的完成的表面与标记点的边界。相应的簇X-簇的特殊完备化的正点集是Teichmuller空间的完备化的一部分。

英文摘要:

A positive space is a space with a positive atlas, i.e. a collection of rational coordinate systems with subtraction free transition functions. The set of positive real points of a positive space is well defined. We define a tropical compactification of the latter. We show that it generalizes the Thurston compactification of a Teichmuller space. The tropical boundary of a positive space is a sphere with a piecewise linear structure. Cluster X-varieties are positive spaces of rather special type. We define special completions of cluster X-varieties. They have a stratification whose strata are (affine closures of) cluster X-varieties. The original coordinate tori extend to coordinate affine spaces in the completion. We define completions of Teichmuller spaces for surfaces with marked points at the boundary. The set of positive points of the special completion of the corresponding cluster X-variety is a part of the completion of the Teichmuller space.

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