摘要 : This paper provides a new fixed point theorem for increasing self-mappings G : B--> B of a closed ball Bsubset ofX, where X is a Banach semilattice which is reflexive or has a weakly fully regular order cone X+. By means of this f... 展开 This paper provides a new fixed point theorem for increasing self-mappings G : B--> B of a closed ball Bsubset ofX, where X is a Banach semilattice which is reflexive or has a weakly fully regular order cone X+. By means of this fixed point theorem, we are able to establish existence results of elliptic problems with lack of compactness. (C) 2002 Elsevier Science (USA). All rights reserved. [References: 36] 收起