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Generalized Caristi's Fixed Point Theorems [PDF]

open access: greenFixed Point Theory and Applications, 2009
AbstractWe present generalized versions of Caristi's fixed point theorem for multivalued maps. Our results either improve or generalize the corresponding generalized Caristi's fixed point theorems due to Bae (2003), Suzuki (2005), Khamsi (2008), and others.
Latif Abdul
openaire   +3 more sources

Fixed point theorem for mappings contracting perimeters of triangles [PDF]

open access: yesJournal of Fixed Point Theory and Applications, 2023
We consider a new type of mappings in metric spaces which can be characterized as mappings contracting perimeters of triangles. It is shown that such mappings are continuous.
E. Petrov
semanticscholar   +1 more source

A Metric Fixed Point Theorem and Some of Its Applications [PDF]

open access: yesGeometric and Functional Analysis, 2022
A general fixed point theorem for isometries in terms of metric functionals is proved under the assumption of the existence of a conical bicombing. It is new for isometries of convex sets of Banach spaces as well as for non-locally compact CAT(0)-spaces ...
A. Karlsson
semanticscholar   +1 more source

On Krasnoselskii's Cone Fixed Point Theorem

open access: yesFixed Point Theory and Applications, 2008
In recent years, the Krasnoselskii fixed point theorem for cone maps and its many generalizations have been successfully applied to establish the existence of multiple solutions in the study of boundary value problems of various types.
Kwong ManKam
doaj   +2 more sources

A converse to Banach's fixed point theorem and its CLS-completeness [PDF]

open access: yesSymposium on the Theory of Computing, 2017
Banach's fixed point theorem for contraction maps has been widely used to analyze the convergence of iterative methods in non-convex problems. It is a common experience, however, that iterative maps fail to be globally contracting under the natural ...
C. Daskalakis   +2 more
semanticscholar   +1 more source

Coupled Fixed-Point Theorems in Theta-Cone-Metric Spaces

open access: yesJournal of Mathematics, 2021
This paper gives further generalizations of some well-known coupled fixed-point theorems. Specifically, Theorem 3 of the paper is the generalization of the Baskar–Lackshmikantham coupled fixed-point theorem, and Theorem 5 is the generalization of the ...
Sahar Mohamed Ali Abou Bakr
doaj   +1 more source

New Applications of Perov’s Fixed Point Theorem

open access: yesMathematics, 2022
The goal of this paper is to consider a differential equation system written as an interesting equivalent form that has not been used before. Using Perov’s fixed point theorem in generalized metric spaces, the existence and uniqueness of the solution are
Sorin Mureşan   +2 more
doaj   +1 more source

GENERALIZED FIXED POINT THEOREM

open access: yesDemonstratio Mathematica, 1983
Let X be a metric space, A be a nonempty closed convex subset of a uniformly convex Banach space \((Y,| \cdot |)\), \(CB(A)\) be the collection of all nonempty closed convex and bounded subsets of A metrized by the Hausdorff metric D. the following Krasnosielskii type fixed point theorem is proved: Suppose that \(\Gamma: A\to X\) is a continuous ...
Kisielewicz, M., Rybiński, L.
openaire   +2 more sources

Some New Generalization of Darbo’s Fixed Point Theorem and Its Application on Integral Equations

open access: yesMathematics, 2019
In this article, we propose some new fixed point theorem involving measure of noncompactness and control function. Further, we prove the existence of a solution of functional integral equations in two variables by using this fixed point theorem in Banach
Anupam Das, B. Hazarika, Poom Kumam
semanticscholar   +1 more source

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