Results 11 to 20 of about 13,725 (250)

Composition of some positive linear integral operators

Demonstratio Mathematica
Abstract This article is devoted to constructing sequences of integral operators with the same Voronovskaja formula as the generalized Baskakov operators, but having different behavior in other respects. For them, we investigate the eigenstructure, the inverses, and the corresponding Voronovskaja type formulas.
Acu, Ana-Maria, Rasa, Ioan, Sofonea, Florin   +2 more
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Kernels for composition of positive linear operators

Journal of Mathematical Analysis and Applications
This paper investigates the composition of Bernstein--Durrmeyer operators and Szász--Mirakjan--Durrmeyer operators, focusing on the structure and properties of the associated kernel functions. In the case of the Bernstein--Durrmeyer operators, we establish new identities for the kernel arising from the composition of two and three operators, from which
Ulrich Abel, Ana Maria Acu, Margareta Heilmann, Ioan Raşa   +3 more
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Extremal non-compactness of composition operators with linear fractional symbol

Journal of Mathematical Analysis and Applications, 2006
We realize norms of most composition operators acting on the Hardy space with linear fractional symbol as roots of hypergeometric functions. This realization leads to simple necessary and sufficient conditions on the symbol to exhibit extremal non-compactness, establishes equivalence of cohyponormality and cosubnormality of composition operators with ...
Basor, Estelle L., Retsek, Dylan Q.
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Linear sums of two composition operators on the Fock space

Journal of Mathematical Analysis and Applications, 2010
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Choe, Boo Rim, Izuchi, Kou Hei, Koo, Hyungwoon   +2 more
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Adjoints of Generalized Composition Operators with Linear Fractional Symbol

Extracta Mathematicae, 2016
Given a positive integer n and φ : U → U, an analytic self-map of the open unit disc in the complex plane, the generalized composition operator Cφ(n) is defined by Cφ(n)f = f (n) ◦ φ for f belonging to some Hilbert space of analytic functions on U. In this paper, we investigate some properties of generalized composition operators on the weighted Hardy ...
Aliakbar Salaryan, Hamid Vaezi
openaire   +2 more sources

Integro-differential equations with bounded operators in Banach spaces [PDF]

Қарағанды университетінің хабаршысы. Математика сериясы, 2022
The paper investigates integro-differential equations in Banach spaces with operators, which are a composition of convolution and differentiation operators.
V.E. Fedorov, A.D. Godova, B.T. Kien
doaj   +3 more sources

Composition Vector Spaces as a New Type of Tri-Operational Algebras

Mathematics, 2021
The aim of this paper is to define and study the composition vector spaces as a type of tri-operational algebras. In this regard, by presenting nontrivial examples, it is emphasized that they are a proper generalization of vector spaces and their ...
Omid Reza Dehghan, Morteza Norouzi, Irina Cristea   +2 more
doaj   +1 more source

Network centrality and portfolio optimization using the genetic algorithm [PDF]

Mathematics and Modeling in Finance, 2021
This study aims to optimize the portfolio using the genetic operator and network centralization. The statistical population of the study is the top 50 companies of Tehran Stock Exchange, in the first quarter of 2021, and to calculate the size of ...
Asghar Abolhasani Hastiany, Alireza Zamanpour   +1 more
doaj   +1 more source

Closed-Form Solutions of Linear Ordinary Differential Equations with General Boundary Conditions

Axioms, 2021
This paper deals with the solution of boundary value problems for ordinary differential equations with general boundary conditions. We obtain closed-form solutions in a symbolic form of problems with the general n-th order differential operator, as well ...
Efthimios Providas, Stefanos Zaoutsos, Ioannis Faraslis   +2 more
doaj   +1 more source

Convergence of Special Sequences of Semi-Exponential Operators

Mathematics, 2022
Several papers, mainly written by J. de la Call and co-authors, contain modifications of classical sequences of positive linear operators to obtain new sequences converging to limits which are not necessarily the identity operator.
Ana Maria Acu, Vijay Gupta, Ioan Raşa, Florin Sofonea   +3 more
doaj   +1 more source