arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.1296math.GT
收藏

拟等距树之间的一个度量

A metric between quasi-isometric trees

Álvaro Martínez-Pérez

摘要:

已知边界上的PQ-对称映射刻画了视双曲空间的拟等距型,特别是测地线完备\br -树的拟等距型。在PQ-对称超度量空间对上定义了一个映射,它刻画了空间的分支。我们还表明,当超度量空间是相应的端空间,这个映射定义了一个度量之间的根测地线完全单纯树的最小顶点度3在同一个拟等距类。此外,这个度量度量标准测量了树离等距有根有多远。

英文摘要:

It is known that PQ-symmetric maps on the boundary characterize the quasi-isometry type of visual hyperbolic spaces, in particular, of geodesically complete \br-trees. We define a map on pairs of PQ-symmetric ultrametric spaces which characterizes the branching of the space. We also show that, when the ultrametric spaces are the corresponding end spaces, this map defines a metric between rooted geodesically complete simplicial trees with minimal vertex degree 3 in the same quasi-isometry class. Moreover, this metric measures how far are the trees from being rooted isometric.

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。

↑