Results 61 to 70 of about 4,766,720 (102)

Orthogonal Stability of an Additive-Quadratic Functional Equation

open access: yesFixed Point Theory and Applications, 2011
Using the fixed point method and using the direct method, we prove the Hyers-Ulam stability of an orthogonally additive-quadratic functional equation in orthogonality spaces. (2010) Mathematics Subject Classification: Primary 39B55; 47H10; 39B52; 46H25.
Park Choonkil
doaj  

A Fixed Point in Partial Sb-Metric Spaces

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2016
In this paper, we introduce an interesting extention of the partial b-metric spaces called partial Sb-metric spaces, and we show the existence of fixed point for a self mapping defined on such spaces.
Souayah Nizar
doaj   +1 more source

Jordan-von Neumann type constant and fixed points for multivalued nonexpansive mappings

open access: yes, 2016
We give some sufficient conditions for the Domı́nguez-Lorenzo condition in terms of the Jordan-von Neumann type constant, and the coefficient of weak orthogonality.
Zhanfei Zuo   +3 more
semanticscholar   +1 more source

Maia type fixed point theorems for Ćirić-Prešić operators

open access: yesActa Universitatis Sapientiae: Mathematica, 2018
The main aim of this paper is to obtain Maia type fixed point results for Ćirić-Prešić contraction condition, following Ćirić L. B. and Prešić S. B. result proved in [Ćirić L. B.; Prešić S. B.
Balazs Margareta-Eliza
doaj   +1 more source

Common fixed points for (ψ,α,β)-weakly contractive mappings in generalized metric spaces

open access: yes, 2013
We establish some common fixed point theorems for mappings satisfying a (ψ,α,β)-weakly contractive condition in generalized metric spaces. Presented theorems extend and generalize many existing results in the literature.MSC: Primary 54H25; secondary ...
H. Işık, D. Türkoglu
semanticscholar   +1 more source

Interpolative Rus-Reich-Ćirić Type Contractions via Simulation Functions

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2019
In this paper, we introduce the notion of interpolative Rus-Reich-Ćirić type 𝒵- contractions in the setting of complete metric space. We also consider some immediate consequences of our main results.
Karapınar Erdal, Agarwal Ravi P.
doaj   +1 more source

On the set of common fixed points of semigroups of nonlinear mappings in modular function spaces

open access: yes, 2014
We prove that the set of all common fixed points for a continuous nonexpansive semigroup of nonlinear mappings acting in modular function spaces can be represented as an intersection of fixed points sets of two nonexpansive mappings.
Saud M. Alsulami, W. Kozlowski
semanticscholar   +1 more source

Characterization of a b-metric space completeness via the existence of a fixed point of Ciric-Suzuki type quasi-contractive multivalued operators and applications

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2019
The aim of this paper is to introduce Ciric-Suzuki type quasi-contractive multivalued operators and to obtain the existence of fixed points of such mappings in the framework of b-metric spaces.
Alolaiyan Hanan   +2 more
doaj   +1 more source

Fixed Point Theorem in Complex Valued Metric Space

open access: yes, 2017
:  The Purpose of this paper is to generalize a theorem of Murthy et al, for a pair of maps in a complex valued metric space in the lines of Murthy et al.2010 mathematics subject classification: primary 47H10; secondary ...
C. Sreedhar
semanticscholar   +1 more source

Revisiting of some outstanding metric fixed point theorems via E-contraction

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2018
In this paper, we introduce the notion of α-ψ-contractive mapping of type E, to remedy of the weakness of the existing contraction mappings. We investigate the existence and uniqueness of a fixed point of such mappings.
Fulga Andreea, Karapınar Erdal
doaj   +1 more source

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