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2011, Abstract and Applied Analysis
AI
This paper discusses the fixed point theory associated with generalized nonexpansive mappings within Banach spaces. It emphasizes the relationship between the fixed point property (FPP) and the geometric features of these spaces, particularly under various structural conditions such as uniform convexity and the Opial condition. The results presented extend classical fixed point results by demonstrating the unique fixed point existence in weakly compact convex subsets and the implications for mappings satisfying specific conditions.
Fixed Point Theory and Applications, 2010
We prove that the set of common fixed points of a given countable family of relatively nonexpansive mappings is identical to the fixed-point set of a single strongly relatively nonexpansive mapping. This answers Kohsaka and Takahashi's question in positive. We also introduce the concept of strongly generalized nonexpansive mappings and prove the analogue version of the result above for Ibaraki-Takahashi's generalized nonexpansive mappings. The duality theorem for two classes of strongly relatively nonexpansive mappings and of strongly generalized nonexpansive mappings is proved.
2012
A Banach space X is said to satisfy property (D) if there exists α ∈ [0,1) such that for any nonempty weakly compact convex subset E of X, any sequence {xn }⊂ E which is regular relative to E, and any sequence {yn }⊂ A(E,{xn}) which is regular relative to E, we have r(E,{yn}) ≤ αr (E,{xn}). A this property is the mild modification of the (DL)-condition. Let X be a Banach space satisfying property (D) and let E be a weakly compact convex subset of X .I fT : E → E is a mapping satisfying condition (E) and (Cλ) for some λ ∈ (0,1). We study the existence of a fixed point for this mapping.
Applied Mathematics Letters, 2010
compact convex subsets of a Banach space X which is uniformly convex in every direction. Furthermore, if {T i } i∈I is any compatible family of strongly nonexpansive self-mappings on such a C and the graphs of T i , i ∈ I, have a nonempty intersection, then T i , i ∈ I, have a common fixed point in C.
Journal of Fixed Point Theory and Applications, 2019
We introduce two types of mappings, namely Reich type nonexpansive and Chatterjea type nonexpansive mappings, and derive some sufficient conditions under which these two types of mappings possess an approximate fixed point sequence (AFPS). We obtain the desired AFPS using the well-known Schäef er iteration method. Along with these, we check some special properties of the fixed point sets of these mappings, such as closedness, convexity, remotality, unique remotality, etc. We also derive a nice interrelation between AFPS and maximizing sequence for both types of mappings. Finally, we will get some sufficient conditions under which the class of Reich type nonexpansive mappings reduces to that of nonexpansive maps.
Nonlinear Analysis Theory Methods Applications, 2002
Fixed Point Theory and Algorithms for Sciences and Engineering, 2024
The aim of this paper is to discuss some results concerning the demiclosedness principle of generalized, nonexpansive mappings in uniformly convex spaces. Further, we present some new fixed-point theorems for generalized nonexpansive mappings in different settings of Banach spaces.
Proceedings of the American Mathematical Society, 2018
Let C be a nonempty, bounded, closed, and convex subset of a Banach space X and T : C → C be a monotone asymptotically nonexpansive mapping. In this paper, we investigate the existence of fixed points of T. In particular, we establish an analogue to the original Goebel and Kirk's fixed point theorem for asymptotically nonexpansive mappings.
Mathematics, 2020
In the paper, we show that some results related to Reich and Chatterjea type nonexpansive mappings are still valid if we relax or remove some hypotheses.
Carpathian Journal of Mathematics
In 2011 Aoyama and Kohsaka introduced the α-nonexpansive mappings. Here we present a further study about them and their relationships with other classes of generalized nonexpansive mappings.
Advances in the Theory of Nonlinear Analysis and its Application
It is defined a class of generalized nonexpansive mappings, which properly contains those defined by Suzuki in 2008, and that preserves some of its fixed point results.
2016
We first obtain some properties of a fundamentally nonexpansive self-mapping on a nonempty subset of a Banach space and next show that if the Banach space is having the Opial condition, then the fixed points set of such a mapping with the convex range is nonempty. In particular, we establish that if the Banach space is uniformly convex, and the range of such a mapping is bounded, closed and convex, then its the fixed points set is nonempty, closed and convex.
Fixed Point Theory and Applications, 2014
We introduce the concept of ψ-firmly nonexpansive mapping, which includes a firmly nonexpansive mapping as a special case in a uniformly convex Banach space. It is shown that every bounded closed convex subset of a reflexive Banach space has the fixed point property for ψ-firmly nonexpansive mappings, an important subclass of nonexpansive mappings. Furthermore, Picard iteration of this class of mappings weakly converges to a fixed point. MSC: 47H06; 47J05; 47J25; 47H10; 47H17
arXiv (Cornell University), 2016
Let C be a nonempty, bounded, closed, and convex subset of a Banach space X and T : C → C be a monotone asymptotic nonexpansive mapping. In this paper, we investigate the existence of fixed points of T. In particular, we establish an analogue to the original Goebel and Kirk's fixed point theorem for asymptotic nonexpansive mappings.
2015
In this paper, we present some fixed point theorems for fundamentally nonexpansive mappings in Banach spaces and give one common fixed point theorem for a commutative family of demiclosed fundamentally nonexpansive mappings on a nonempty weakly compact convex subset of a strictly convex Banach space with the Opial condition and a uniformly convex in every direction Banach space, respectively; moreover, we show that the common fixed points set of such a family of mappings is closed and convex.
Bulletin of the Iranian Mathematical Society, 2019
In this article, we introduce the concepts of multivalued (DL)-type and multivalued α-nonexpansive mappings in the Banach spaces. We show that these two classes of mappings properly contain some important classes of nonlinear mappings. Moreover, we compare the relationship between such classes of mappings and obtain some fixed point results. In addition, we give partial answer to the open question posed by Reich in 1983, about the relationship between fixed point property of multivalued and singlevalued nonexpansive mappings. This contribution generalizes and improves some recent results in this context.
International Journal of Nonlinear Analysis and Applications, 2021
In this paper, we introduce a condition on mappings and show that the class of these mappings is broader than both the class of mappings satisfying condition (C) and the class of fundamentally nonexpansive mappings, and it is incomparable with the class of quasi-nonexpansive mappings and the class of mappings satisfying condition (L). Furthermore, we present some convergence theorems and fixed point theorems for mappings satisfying the condition in the setting of Banach spaces. Finally, an example is given to support the usefulness of our results.
Abstract and Applied …, 2003
Let X be a Banach space whose characteristic of noncompact convexity is less than 1 and satisfies the nonstrict Opial condition. Let C be a bounded closed convex subset of X, KC(C) the family of all compact convex subsets of C, and T a nonexpansive mapping from C into KC(C). We prove that T has a fixed point. The nonstrict Opial condition can be removed if, in addition, T is a 1-χcontractive mapping.
Arabian Journal of Mathematics, 2012
Recall that a Banach space X has the weak fixed point property if for any nonempty weakly compact subset C of X and any nonexpansive mapping T : C→C, T has at least one fixed point. In this article, we present three recent results using the ultraproduct technique. We also provide some open problems in this area.
Applicable Analysis and Discrete Mathematics, 2012
A very general class of multivalued generalized nonexpansive mappings is defined. We also give some fixed point results for these mappings, and finally we compare and separate this class from the other multivalued generalized nonexpansive mappings introduced in the recent literature.
In this paper, we approximate fixed points of generalized nonexpansive mappings in Banach spaces under relatively faster iteration schemes and also prove some weak and strong convergence theorems. Our results generalize and improve several previously known results of the existing literature. 605 606 ANUPAM SHARMA * , MOHAMMAD IMDAD pointed out that a nonexpansive self-mapping defined on a weakly compact and convex subset K of E need not have a fixed point. A self-mapping T defined on a subset K of a Banach space
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