关于完备度量空间上4个自映射的公共不动点

COMMON FIXED POINTS OF FOUR MAPPINGS IN A COMPLETE METRIC SPACE

本文通过引进完备度量空间Ｘ上两个自映射的拟弱交换的概念，把Ｓ．Ｓｅｓｓａ和Ｂ．Ｆｉｓｈｅｒ在［１］中得到的主要定理３推广到拟弱交换的自映射的情形，它以［１］的定理３作为其特款，同时我们给出适当的例子以说明所作推广的意义．

By introducing the concept of quasi weak commutativity of two selfmappings in a complete metric space,we establish a common fixed point theorem for four selfmappings of a complete metric space.This result generalizes the main theorem 3 in and suitable examples are given.