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Non-expanding maps and Busemann functions

机译:非展开图和Busemann函数

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摘要

We give stronger versions and alternative simple proofs of some results of Beardon, [Be1] and [Be2]. These results concern contractions of locally compact metric spaces and generalize the theorems of Wolff and Denjoy about the iteration of a holomorphic map of the unit disk. In the case of unbounded orbits, there are two types of statements which can sometimes be proven; first, about invariant horoballs, and second, about the convergence of the iterates to a point on the boundary. A few further remarks of similar type are made concerning certain random products of semicontractions and also concerning semicontractions of Gromov hyperbolic spaces.
机译:我们给出Beardon,[Be1]和[Be2]的某些结果的更强版本和替代性简单证明。这些结果涉及局部紧度量空间的收缩,并推广了Wolff和Denjoy关于单位圆盘全纯图迭代的定理。在无界轨道的情况下,有时可以证明两种陈述:首先,关于不变的球,其次,关于迭代器收敛到边界上的一个点。对于半收缩的某些随机乘积以及Gromov双曲空间的半收缩,还提出了一些类似类型的说明。

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