两个新的多值压缩映射不动点定理
Definition 1 Suppose D a closed set in Banach Space X. If δ(x)>0 holds for every x∈D and x+δ‖y-x‖(x-y)∈D is valid with δ<δ(x) for any y∈D, D is called a δ-closed set.
作 者: 伊宏伟 YI Hong-wei 作者单位: 刊 名: 辽宁师范大学学报(自然科学版) ISTIC PKU 英文刊名: JOURNAL OF LIAONING NORMAL UNIVERSITY(NATURAL SCIENCE EDITION) 年,卷(期): 2008 31(2) 分类号: O1 关键词: