Results 1 to 10 of about 347 (47)
On the compactness and the essential norm of operators defined by infinite tridiagonal matrices
Concrete Operators, 2023 In this article, all sequences u{\boldsymbol{u}}, v{\boldsymbol{v}}, and w{\boldsymbol{w}} that define continuous and compact tridiagonal operators Tu,v,w{T}_{u,v,w} acting on the weighted sequence space lβ2{l}_{\beta }^{2} were characterized ...
Caicedo Alexander +2 more
doaj +1 more source
Bu’s theorem in the positive situation
Moroccan Journal of Pure and Applied Analysis, 2022 In this paper, we valorize the relationship between positive p−summing operators and positive strongly q−summing operators using (Contemp. Math. 328, 145 − 149 (2003)).
Bougoutaia Amar, Belacel Amar
doaj +1 more source
Domination and Kwapień’s factorization theorems for positive Cohen p–nuclear m–linear operators
Moroccan Journal of Pure and Applied Analysis, 2021 In this paper, we introduce and study the concept of positive Cohen p-nuclear multilinear operators between Banach lattice spaces. We prove a natural analog to the Pietsch domination theorem for this class.
Bougoutaia Amar +2 more
doaj +1 more source
Fixed Point Theory and Applications, 2013 In this paper, we introduce the concept of order-clustered fixed point of set-valued mappings on preordered sets and give several generalizations of the extension of the Abian-Brown fixed point theorem provided in (Mas-Colell et al.
Linsen Xie, Jinlu Li, Wenshan Yang
semanticscholar +2 more sources
Non-squareness properties of Orlicz-Lorentz function spaces
Journal of Inequalities and Applications, 2013 In this paper, criteria for non-squareness and uniform non-squareness of Orlicz-Lorentz function spaces Λφ,ω are given. Since degenerated Orlicz functions φ and degenerated weight functions ω are also admitted, this investigation concerns the most ...
P. Foralewski, H. Hudzik, P. Kolwicz
semanticscholar +2 more sources
Fixed Point Theory and Applications, 2013 We say that a noncooperative game is nonmonetized if the ranges of the utilities of the players are posets. In this paper, we examine some nonmonetized noncooperative games of which both the collection of strategies and the ranges of the utilities for ...
Linsen Xie, Jinlu Li, C. Wen
semanticscholar +2 more sources
Topological properties of the block numerical range of operator matrices
, 2020 We show that the block numerical range of an n×n -operator matrix A corresponding to an operator A on the Banach space X with respect to a decomposition X = ∏Xj has at most n connected components.
Agnes Radl, M. Wolff
semanticscholar +1 more source
Points of nonsquareness of Lorentz spaces Γp,w
Journal of Inequalities and Applications, 2014 Criteria for nonsquare points of the Lorentz spaces of maximal functions Γp,w are presented under an arbitrary (also degenerated) nonnegative weight function w.
P. Kolwicz, Agata Panfil
semanticscholar +2 more sources
Weak compactness of almost limited operators [PDF]
, 2014 The paper is devoted to the relationship between almost limited operators and weakly compacts operators. We show that if $F$ is a $\sigma $-Dedekind complete Banach lattice then, every almost limited operator $T:E\rightarrow F $ is weakly compact if and ...
Elbour, A., Machrafi, N., Moussa, M.
core +3 more sources
Fixed point theorems on ordered vector spaces
Fixed Point Theory and Applications, 2014 In this paper, we introduce the concept of ordered metric spaces with respect to some ordered vector spaces, which is an extension of the normal metric spaces.
Jin Lu Li, Cong-Jun Zhang, Qi Qiong Chen
semanticscholar +2 more sources