Results 51 to 60 of about 657 (84)

Variational characterizations of weighted Hardy spaces and weighted $BMO$ spaces [PDF]

arXiv, 2020
This paper obtains new characterizations of weighted Hardy spaces and certain weighted $BMO$ type spaces via the boundedness of variation operators associated with approximate identities and their commutators, respectively.
arxiv  

Existence and uniqueness of solutions for certain functional equations and system of functional equations arising in dynamic programming

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2016
This paper deals with the existence, uniqueness and iterative approximations of solutions for the functional equations and system of functional equations arising in dynamic programming of multistage decision making processes in Banach spaces and complete
Deepmala, Agarwal Ravi P.
doaj   +1 more source

Quasi-Fredholm, Saphar Spectra for Integrated Semigroup [PDF]

arXiv, 2018
In this paper, we show a spectral inclusion of integrated semigroups for Saphar, essentially Saphar and quasi-Fredholm spectra.
arxiv  

Bi-additive s-functional inequalities and biderivations in modular spaces [PDF]

arXiv, 2020
In this article, by using the fixed point method, we prove the generalized Hyers--Ulam stability of biderivations from an algebra to a modular space, associated to bi-additive s-functional inequalities.
arxiv  

Characterizing Jordan derivations of matrix rings through zero products [PDF]

, 2013
Let $\Mn$ be the ring of all $n \times n$ matrices over a unital ring $\mathcal{R}$, let $\mathcal{M}$ be a 2-torsion free unital $\Mn$-bimodule and let $D:\Mn\rightarrow \mathcal{M}$ be an additive map. We prove that if $D(\A)\B+ \A D(\B)+D(\B)\A+ \B D(\
Ghahramani, Hoger
core  

A posteriori analysis of the spectral element discretization of heat equation

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2014
In this paper, we present a posteriori analysis of the discretization of the heat equation by spectral element method. We apply Euler’s implicit scheme in time and spectral method in space.
Chorfi Nejmeddine, Abdelwahed Mohamed, Ben Omrane Ines   +2 more
doaj   +1 more source

Commutators of multilinear fractional maximal operators with Lipschitz functions on Morrey spaces

Open Mathematics
In this work, we present necessary and sufficient conditions for the boundedness of the commutators generated by multilinear fractional maximal operators on the products of Morrey spaces when the symbol belongs to Lipschitz spaces.
Zhang Pu, Ağcayazı Müjdat
doaj   +1 more source

Derivations on triangular Banach algebras of order three [PDF]

arXiv, 2013
In this paper, we define some new notions of triangular Banach algebras and we investigate the derivations on these algebras.
arxiv  

Some estimates for the norm of the self-commutator [PDF]

arXiv, 2014
Different estimates for the norm of the self-commutator of a Hilbert space operator are proposed. Particularly, this norm is bounded from above by twice of the area of the numerical range of the operator. An isoperimetric-type inequality is proved.
arxiv  

A simulation algorithm for a single server retrial queuing system with batch arrivals

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2015
Many systems of real word are modeled by retrial queuing system with batch arrivals. Analytical formulas for this class of systems are complicated and address only particular cases.
Florea Ion, Nǎnǎu Corina-Ştefania
doaj   +1 more source