文章编号:1673-5862(2023)05-0454-05
摘"""要:Banach压缩映射原理在非线性分析中起着重要作用,它是解决完备度量空间中不动点的存在性和唯一性问题的有效方法,在基础数学和应用数学中有着广泛的应用,近年来该定理在多个方面得到了推广。在b-度量空间的背景下,研究一类新的F-型压缩映射对的公共不动点定理。首先,在b-度量空间中引入一类新的平方型F-型压缩条件;其次,利用2个映射的包含关系,构造一个序列,并通过使用F-函数的性质、数学归纳法及压缩条件证明该序列相邻项距离的极限为零,进而得到该序列是一个柯西列;最后,结合空间的完备性和压缩条件,得出2个映射具有重合值,再利用映射的弱相容条件,进一步证明该映射对具有公共不动点,同时给出了一个具体例子来说明结果的有效性。
关"键"词:不动点; F-型压缩; b-度量空间; 柯西列
中图分类号:O174.1""""文献标志码:A
doi:10.3969/j.issn.1673-5862.2023.05.013
Common fixed point theorems of a new class of F-type contractive mappings
GUAN Hongyan, WANG Qiancheng
(College of Mathematics and Systems Science, Shenyang Normal University, Shenyang 110034, China)
Abstract:The Banach contraction mapping principle plays an important role in nonlinear analysis. It is an effective method to solve the problem of the existence and uniqueness of fixed points in complete metric space. It has a wide range of applications in basic mathematics and applied mathematics, and has been promoted from various angles. In the setting of b-metric spaces, we study a new class of common fixed point theorems for F-type contraction mappings. Firstly, a new class of F-type contractive condition is introduced. After that, a new sequence is constructed by using the inclusion relation of two mappings. Using the properties of type F-functions, mathematical induction and contractive conditions, it is proved that the limit of the distance between adjacent terms is zero, then the sequence is Cauchy sequence. Secondly, combining the completeness of the space and contraction conditions, we prove that the two mappings possess a point of coincidence, and then they have a common fixed point by using of weak compatible conditions. At the same time, an example is provided to demonstrate the effectiveness of the results.
Key words:fixed point; F-type contraction; b-metric spaces; Cauchy sequence
不动点理论是现代分析学中的一个重要的组成部分,特别是Banach压缩映射原理是解决完备度量空间中不动点的存在性和唯一性问题的有效方法,在非线性分析中起着重要作用。Banach[1]在完备的度量空间中证明了压缩映射具有唯一的不动点。之后,众多学者通过改变空间类型或者压缩条件,给出了该结果的一些重要推广。1993年,Czerwik[2]通过改变度量空间定义的三角不等式的形式,给出了一种推广的度量空间的概念,称为b-度量空间,并在该类空间中证明了一些新的不动点定理。在该类空间中,许多学者展开了研究,得到了大量的优秀成果[3-11]。2012年,Wardowski[12]在完备度量空间中给出了一类新型的压缩映射,即F-型压缩,并得到了一些关于该类型映射的不动点存在且唯一的充分条件。
本文受文献[12]的启发,在b-度量空间中引入新的平方型F-型压缩条件,证明映射对具有公共不动点,并给出一个具体例子说明了该结果的有效性。
1"基础知识
2"主要成果
3"结""语
本文在b-度量空间中引入了一类新的F-型压缩条件,研究了映射对的公共不动点的存在性条件,并给出了一个例子详细说明了既得结果的实用性。
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收稿日期:2023-04-16
基金项目:辽宁省教育厅基本科研项目(JYTMS20231700)。
作者简介:关洪岩(1980—),男(满族),辽宁葫芦岛人,沈阳师范大学副教授,博士。