Results 1 to 10 of about 449 (127)

Measures of noncompactness on w-distance spaces [PDF]

open access: yesMathematica Moravica, 2021
The aim of this paper is to provide a new framework for the study of measures of noncompactness in generalized metric spaces. Firstly, we introduce the notion of w-measure of noncompactness on metric spaces with a w-distance and extend the diameter and ...
Kostić Aleksandar
doaj   +3 more sources

ON MEASURES OF NONCOMPACTNESS IN INEQUALITIES

open access: yesНаучный вестник МГТУ ГА, 2017
Measures of noncompactness are numerical characteristics of bounded subsets of metric space, equal to zero on relatively compact subsets. The quantitative characteristic of measure of noncompactness of metric space subset was introduced by K. Kuratovskiy
N. A. Erzakova
doaj   +1 more source

On solutions of a hybrid generalized Caputo-type problem via the noncompactness measure in the generalized version of Darbo’s criterion

open access: yesJournal of Inequalities and Applications, 2023
In this manuscript, we study the existence and uniqueness of solutions for a new neutral hybrid nonlinear differential equation in the context of a fractional generalized operator in the sense of ψ-Caputo.
Naas Adjimi   +5 more
doaj   +1 more source

Existence and Uniqueness for a Class of SPDEs Driven by L\'{e}vy Noise in Hilbert Spaces [PDF]

open access: yesSahand Communications in Mathematical Analysis, 2021
The present paper seeks to prove the existence and uniqueness of solutions to stochastic evolution equations in Hilbert spaces driven by both Poisson random measure and Wiener process with non-Lipschitz drift term.
Majid Zamani   +2 more
doaj   +1 more source

Coupled measure of noncompactness and functional integral equations

open access: yesOpen Mathematics, 2022
The aim of this article is to study the results of the fixed-point in coupled and tripled measure of noncompactness (MNC). We will use the technique of MNC for coupled and tripled MNC.
Hosseinzadeh Hasan   +3 more
doaj   +1 more source

A New Survey of Measures of Noncompactness and Their Applications

open access: yesAxioms, 2022
We present a survey of the theory of measures of noncompactness and discuss some fixed point theorems of Darbo’s type. We apply the technique of measures of noncompactness to the characterization of classes of compact operators between certain sequence ...
Moosa Gabeleh   +3 more
doaj   +1 more source

MEASURES OF NONCOMPACTNESS IN ULTRAPRODUCTS [PDF]

open access: yesBulletin of the Australian Mathematical Society, 2009
AbstractWe investigate the connection between measures of noncompactness of a bounded subset of a given Banach space and the corresponding measures of noncompactness of an ultrapower of this subset. The Kuratowski, Hausdorff and separation measures of noncompactness are considered. We prove that in the first two cases the measures of a subset are equal
WIESŁAWA KACZOR   +3 more
openaire   +1 more source

The Technique of Quadruple Fixed Points for Solving Functional Integral Equations under a Measure of Noncompactness

open access: yesMathematics, 2020
Under the idea of a measure of noncompactness, some fixed point results are proposed and a generalization of Darbo’s fixed point theorem is given in this manuscript.
Hasanen A. Hammad, Amal A. Khalil
doaj   +1 more source

Best proximity point results and application to a system of integro-differential equations

open access: yesAdvances in Difference Equations, 2021
In this work, we solve the system of integro-differential equations (in terms of Caputo–Fabrizio calculus) using the concepts of the best proximity pair (point) and measure of noncompactness.
Anupam Das   +3 more
doaj   +1 more source

Solvability of functional-integral equations (fractional order) using measure of noncompactness

open access: yesAdvances in Difference Equations, 2020
We investigate the solutions of functional-integral equation of fractional order in the setting of a measure of noncompactness on real-valued bounded and continuous Banach space.
Reza Arab   +3 more
doaj   +1 more source

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