锥b-度量空间上映射的公共不动点定理（英文）

本文研究了锥b-度量空间上四个自映射的公共不动点问题.利用序列逼近的方法,获得了锥b-度量空间上四个自映射的一些公共不动点结果,将锥度量空间中的几个相关结果推广到锥b-度量空间中,并且给出了一个例子以支撑我们的结果.     

锥b-Banach空间上非扩张映射的不动点定理

在锥b-Banach空间上考虑多个映射的公共不动点问题,利用Mann迭代法以及锥b-范数的条件下证明锥b-Banach空间上多个映射的公共不动点的存在性.     

b-距离空间中含有四个映射的Ciri型公共不动点定理

在b-距离空间中建立了含有四个映射的Ciri型公共不动点定理.这一结果统一和改进了Roshan等人的结果.进一步,利用Du的标量化方法,获得了TVS-锥b-距离空间中的一些公共不动点定理.     

锥b-度量空间中广义拟压缩映射的不动点定理（英文）

2011年,Hussain,Shah和张分别提出锥b-度量空间和广义拟压缩.前者给出锥b-度量空间的一些拓扑性质,然而后者得到锥度量空间中正规条件下的唯一不动点结果.依据Hussain,Shah和张的结果,这篇文章证明在非正规锥条件下,系数s≥1的锥b-度量空间中满足广义拟压缩及压缩条件λ∈(0,1/2)的自映射的不动点定理.我们的结果推广和改进了一些重要的相关结果.     

锥b-度量空间中关于扩张映射的一些不动点定理（英文）

本文证明锥b-度量空间中关于扩张映射的一些不动点定理,没有考虑映射的连续性和锥的正规性.其结果不仅推广了锥度量空间,度量空间和b-度量空间中的相关结果,而且也延拓和补充了先前的一些结果.此外,我们给出几个例子验证了其结论.     

具有Banach代数的锥b-度量空间上广义g-拟压缩映射的不动点定理及其应用

本文在具有Banach代数的锥b-度量空间上引入广义g-拟压缩映射,无需正规性条件,得到了广义g-拟压缩映射的不动点存在唯一性,从而将′Ciri′c不动点定理推广到具有Banach代数的锥b-度量空间的情形,主要结果改进和推广了有关文献中的相应结论,并将有关结果应用于非线性积分方程.     

锥b-度量空间上的多值映射不动点定理及其多值分形定理(英文)

在这篇文章中,我们介绍在锥b-度量空间中的一个推广的距离.运用这个推广的距离,我们证明一些不同的多值映射不动点定理并研究在锥b-度量空间的多值映射的分形定理.     

巴拿赫代数上锥b-度量空间中压缩映射不动点定理

在对巴拿赫代数上的锥度量空间的压缩条件研究的基础上,运用迭代和限制谱半径的方法,证明了巴拿赫代数上的锥b-度量空间的压缩映射不动点定理,将锥度量空间的压缩条件推广到巴拿赫代数上的锥b-度量空间中.     

锥度量空间上混合型膨胀映射族的唯一公共不动点

引进了一类混合型膨胀映射族,并在锥度量空间上证明了此类映射族具有唯一公共不动点的定理,同时给出了相应的不动点定理,推广和改进了文献中关于第I膨胀映射的相应的公共不动点和不动点定理.     

巴拿赫代数上锥b-距离空间中压缩映射不动点定理

给出了巴拿赫代数上锥b-距离空间的概念,利用迭代法探究了巴拿赫代数上锥b-距离空间中压缩映射不动点定理,证明了广义利普希茨映射在没有正规性的条件下,仍存在不动点并且是唯一的.     

TVS-值锥度量空间上拟-Lipschitz型映射族的公共不动点

在TVS-值锥度量空间上给出若干可数个满足拟-Lipschitz条件的满映射族的唯一公共不动点的存在性定理.主要结论推广和改进了文献中的一些相应结论.     

Common fixed points in cone metric spaces

In this paper we consider a notion of g-weak contractive mappings in the setting of cone metric spaces and we give results of common fixed points. This results generalize some common fixed points results in metric spaces and some of the results of Huang and Zhang in cone metric spaces. Supported by Universitá degli Studi di Palermo, R. S. ex 60%.     

序锥度量空间中涉及距离改变函数的拟压缩的公共不动点结果（英文）

Some common fixed point results for mappings satisfying a quasi-contractive condition which involves altering distance functions are obtained in partially ordered complete cone metric spaces. A sufficient condition for the uniqueness of common fixed point is proved. Also, an example is given to support our results.     

半序锥度量空间中新公共不动点定理(英文)

该文在半序锥度量空间中研究了有关三个映射的公共不动点的存在唯一性,不要求映射的连续性和交换性,也不要求锥的正规性,其结果改进并推广了文献中的一些重要结论.     

Functionals strictly subjected to convergent series and search for singularities of mappings

This paper is a continuation of the author’s previous works where the concepts of search functionals were introduced and used to develop methods of cascade search for singularities of mappings between metric spaces. Such singularities of mappings were considered as coincidences, common preimages, common fixed points and common roots of finite sets of mappings. In this paper, a new class of functionals strictly subjected to convergent series is introduced. With the help of such functionals the problems of local search for the above-mentioned singularities of mappings between metric spaces are investigated. Some new iteration schemes are suggested. Generalizations of several known results are obtained.     

Fixed and periodic point results in cone metric spaces

Huang and Zhang [L.-G. Haung, X. Zhang, Cone metric spaces and fixed point theorems of contractive mappings, J. Math. Anal. Appl. 332 (2007) 1468–1476] proved some fixed point theorems in cone metric spaces. In this work we prove some fixed point theorems in cone metric spaces, including results which generalize those from Haung and Zhang’s work. Given the fact that, in a cone, one has only a partial ordering, it is doubtful that their Theorem 2.1 can be further generalized. We also show that these maps have no nontrivial periodic points.     

Coincidence and common fixed point theorems for nonlinear contractions in Menger PM spaces

In this paper, we prove some existence results on coincidence and common fixed points of two pairs of self mappings without continuity under relatively weaker commutativity requirement in Menger PM spaces. Our results generalize many known results in Menger as well as metric spaces. Some related results are also derived besides furnishing illustrative examples.     

Fixed point theorem on two complete cone metric spaces

Some related fixed points theorems on two complete cone metric spaces are proved. These results generalize some known results in metric spaces.     

Common fixed points of almost generalized contractive mappings in ordered metric spaces

The existence theorems of common fixed points for two weakly increasing mappings satisfying an almost generalized contractive condition in ordered metric spaces are proved. Some comparative example are constructed which illustrate the values of the obtained results in comparison to some of the existing ones in literature.     

Weakly <Emphasis Type="Italic">φ</Emphasis>-pairs and common fixed points in cone metric spaces

In this paper we introduce a weak contractive condition, called weakly φ-pair, for two mappings in the framework of cone metric spaces and we prove a theorem which ensures existence and uniqueness of common fixed points for such mappings. Also we obtain a result on points of coincidence. These results extend and generalize well-known comparable results in the literature. The authors are supported by Università degli Studi di Palermo, R. S. ex 60%.