On Kirk's asymptotic contractions

On Kirk's asymptotic contractions
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关于柯克的渐近收缩

DOI:
10.1016/j.jmaa.2004.06.037
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发表时间:
2004
影响因子:
1.3
通讯作者:
I. Jóźwik
I. Jóźwik
中科院分区:
数学3区
文献类型:
--
作者:
J. Jachymski;I. Jóźwik

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最近,Kirk在度量空间上引入了渐近压缩的概念,并利用超幂技巧得到了Boyd-Wong不动点定理的渐近版本。本文推广了这一结果,并给出了一个构造性的证明。此外,我们还得到了紧度量空间上渐近压缩的完全刻画。作为副产品,我们建立了满足一定极限条件的上半连续函数的分离定理。
Recently Kirk introduced the notion of asymptotic contractions on a metric space and using ultrapower techniques he obtained an asymptotic version of the Boyd–Wong fixed point theorem. In this paper we extend this result and moreover, we give a constructive proof of it. Furthermore, we obtain a complete characterization of asymptotic contractions on a compact metric space. As a by-product we establish a separation theorem for upper semicontinuous functions satisfying some limit condition.
DOI: 10.1007/978-3-662-00547-7
发表时间: 1985
期刊: --
影响因子: --
作者:
K. Deimling
通讯作者: K. Deimling