Results 1 to 10 of about 5,601,704 (278)

Eigenvalue Problems for Fredholm Operators with Set-Valued Perturbations [PDF]

Advanced Nonlinear Studies, 2020
By means of a suitable degree theory, we prove persistence of eigenvalues and eigenvectors for set-valued perturbations of a Fredholm linear operator.
Benevieri Pierluigi, Iannizzotto Antonio
doaj   +3 more sources

Representation of set valued operators [PDF]

Transactions of the American Mathematical Society, 1985
In this paper we prove representation theorems for set valued additive operators acting on the spaces L X 1
Papageorgiou, N, Nikolaos S. Papageorgiou   +1 more
openaire   +4 more sources

On Lipschitzian operators of substitution generated by set-valued functions [PDF]

Opuscula Mathematica, 2007
We consider the Nemytskii operator, i.e., the operator of substitution, defined by \((N \phi)(x):=G(x,\phi(x))\), where \(G\) is a given multifunction. It is shown that if \(N\) maps a Hölder space \(H_{\alpha}\) into \(H_{\beta}\) and \(N\) fulfils the ...
Jakub Jan Ludew
doaj   +1 more source

Prioritized Linguistic Interval-Valued Aggregation Operators and Their Applications in Group Decision-Making Problems

Mathematics, 2018
The linguistic interval-valued intuitionistic fuzzy (LIVIF) set is an efficient tool to represent data in the form of interval membership degrees in a qualitative rather than a quantitative manner.
Kamal Kumar, Harish Garg
exaly   +3 more sources

On Interpolative Prešić-Type Set-Valued Contractions

Journal of Mathematics, 2022
This study aims to present the notions of interpolative Prešić-type set-valued contractions for the set-valued operators defined on product spaces.
Monairah Alansari, Ghada Ali Basendwah, Muhammad Usman Ali   +2 more
doaj   +1 more source

Complex interval-valued intuitionistic fuzzy decision support system with application to COVID-19 healthcare facilities

Complex & Intelligent Systems, 2023
The complex interval-valued intuitionistic fuzzy set (CIIFS), as an extension of the complex intuitionistic fuzzy set (CIFS), is one of the better tools for dealing with time-periodic information in a single set of two-dimensional information.
Muhammad Sajjad Ali Khan, Saeed Ullah Jan, Rahim Jan, Tapan Senapati, Sarbast Moslem   +4 more
doaj   +1 more source

Several Theorems on Single and Set-Valued Prešić Type Mappings

Mathematics, 2020
In this study, we introduce set-valued Prešić type almost contractive mapping, Prešić type almost F-contractive mapping and set-valued Prešić type almost F-contractive mapping in metric space and prove some fixed point results for these mappings ...
Seher Sultan Yeşilkaya, Cafer Aydın
doaj   +1 more source

An Approach for the Assessment of Multi-National Companies Using a Multi-Attribute Decision Making Process Based on Interval Valued Spherical Fuzzy Maclaurin Symmetric Mean Operators

Axioms, 2022
Many fuzzy concepts have been researched and described with uncertain information. Collecting data under uncertain information is a difficult task, especially when there is a difference between the opinions of experts.
Ansa Ashraf, Kifayat Ullah, Darko Božanić, Amir Hussain, Haolun Wang, Adis Puška   +5 more
doaj   +1 more source

On automatic boundedness of Nemytskiĭ set-valued operators [PDF]

Studia Mathematica, 1995
Let \(\Omega\) be a measure space, \(X\) and \(Y\) two separable Fréchet spaces, and \(F: \Omega\times X\to 2^Y\) a sup-measurable multifunction. The authors show that, whenever the superposition operator generated by \(F\) acts between two modular spaces, it is automatically bounded on bounded sets.
Rolewicz, S., Song, Wen
openaire   +2 more sources

Short Introduction to Standard and NonStandard Neutrosophic Set and Logic (review paper) [PDF]

Neutrosophic Sets and Systems
The definitions of Single-Valued Neutrosophic Set (SVNS), Interval-Valued Neutrosophic Set (IVNS), Subset-Valued Neutrosophic Set (SVNS), and respectively NonStandard Neutrosophic Set [Single-Valued (NoS SVNS), Interval-Valued (NoS IVNS), and Subset ...
Florentin Smarandache
doaj   +1 more source