Results 1 to 10 of about 8,676 (264)
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
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
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, Kumar Kamal
exaly +3 more sources
Algorithms, 2018 Based on the probabilistic interval-valued hesitant fuzzy information aggregation operators, this paper investigates a novel multi-attribute group decision making (MAGDM) model to address the serious loss of information in a hesitant fuzzy information ...
Wenying Wu, Zhiwei Ni, Feifei Jin
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 +2 more
doaj +1 more source
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 +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
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
Random fixed points of set-valued operators [PDF]
Proceedings of the American Mathematical Society, 1996 Some random fixed point theorems for set-valued operators are obtained. The measurability of certain marginal maps is also studied. The underlying measurable space is not assumed to be a Suslin family.
Domínguez Benavides, Tomás +2 more
openaire +2 more sources
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 +5 more
doaj +1 more source