广义集值映射不动点的推广
2016-11-05鲁晓峰吴贤璇
鲁晓峰, 吴贤璇
(广东工业大学 应用数学学院, 广州 510520)
广义集值映射不动点的推广
鲁晓峰, 吴贤璇
(广东工业大学 应用数学学院, 广州 510520)
引入似度量空间的概念, 用上方下半连续方法证明了一类广义S.B.Nadler集值压缩映射在完备似度量空间中有不动点, 并推广和改进了一些已知结果.
似度量空间; 集值映射; 不动点
引言
不动点理论研究在二十世纪二、三十年代十分热门, 最初由荷兰数学家Brouwer发现n维欧式空间中的单位球到单位球连续映射中, 存在一个不动点, 由此引起了许多数学研究者对这一方面的兴趣, 随后推广到了集值不动点[3,4]. 近几十年来国内也有不少文献讨论集值压缩不动点理论[10~12]. 本文主要使用上方下半连续方法证明广义集值映射[12]有不动点.
主要结果
本文的主要目的是讨论一些集值映射不动点, 并推广和改进文[4]和[12]的一些主要结果.
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Fixed Point Theorems for Set-valued Mappings
LU Xiao-feng, WU Xian-xuan
(Guangdong University of Technology, School of Applied Mathematics, Guangzhou, Guangdong 510520)
In this paper, we introduce the concept of like-metric spaces and prove the set valued contractive mappings on complete like-metric space have a fixed point in a class of generalized S.B.Nadler using the method of lower semi-continuity from above, improve some well-known results.
like-metric space; set value mapping; fixed point
O177.91
A
1672-5298(2016)03-0014-07
2016-06-10
国家自然科学基金资助项目(10871052)
鲁晓峰(1991- ), 女, 湖南湘潭人, 广东工业大学应用数学学院硕士研究生. 主要研究方向: 非线性泛函分析
吴贤璇(1991- ), 女, 广东汕头人, 广东工业大学应用数学学院硕士研究生. 主要研究方向: 非线性泛函分析