拉伸压缩不动点定理

Fixed Theorems of Compression and Expansion

孙经先(1987)证明了K-集压缩映射(K<1)在球上范数形式的拉伸与压缩不动点定理及锥拉伸与锥压缩不动点定理,本文将球推广为含θ的、满足-D=D 的有界凸开集D 上.

This paper is to give a fixed theorem of compression.and expansion on bounded co-nvex.open set D with-D=D.it is a extension of Sun Jingxian's fixed theorem onball.