Results 11 to 20 of about 41,011 (239)

Multiple solutions of nonlinear partial functional differential equations and systems

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2019
We shall consider weak solutions of initial-boundary value problems for semilinear and nonlinear parabolic differential equations with certain nonlocal terms, further, systems of elliptic functional differential equations.
László Simon
doaj   +1 more source

Three Positive Periodic Solutions for a Class of Higher-Dimensional Functional Differential Equations with Impulses on Time Scales

open access: yesAdvances in Difference Equations, 2009
By using a multiple fixed point theorem (Avery-Peterson fixed point theorem) for cones, some criteria are established for the existence of three positive periodic solutions for a class of higher-dimensional functional differential equations with impulses
Yongkun Li, Meng Hu
doaj   +2 more sources

Functional derivatives applied to error propagation of uncertainties in topography to large-aperture scintillometer-derived heat fluxes [PDF]

open access: yesAtmospheric Measurement Techniques, 2014
Scintillometer measurements allow for estimations of the refractive index structure parameter Cn2 over large areas in the atmospheric surface layer. Turbulent fluxes of heat and momentum are inferred through coupled sets of equations derived from the ...
M. A. Gruber   +3 more
doaj   +1 more source

A package for symbolic solution of real functional equations of real variables

open access: yesAequationes Mathematicae, 1997
The authors describe a Mathematica package for the solution of functional equations. Solving functional equations is a tricky business. Most people working in the field have a bagful of equations whose solution is known and a bag of tricks (methods to reduce to these and thus solve other equations), nobody knows everything.
Castillo, Enrique, Iglesias, Andres
openaire   +1 more source

Generating Functions for q-Apostol Type Frobenius–Euler Numbers and Polynomials

open access: yesAxioms, 2012
The aim of this paper is to construct generating functions, related to nonnegative real parameters, for q-Eulerian type polynomials and numbers (or q-Apostol type Frobenius–Euler polynomials and numbers).
Yilmaz Simsek
doaj   +1 more source

The Technique of Measures of Noncompactness in Banach Algebras and Its Applications to Integral Equations

open access: yesAbstract and Applied Analysis, 2013
We study the solvability of some nonlinear functional integral equations in the Banach algebra of real functions defined, continuous, and bounded on the real half axis.
Józef Banaś, Szymon Dudek
doaj   +1 more source

An Iterative Method for Curve Adjustment Based on Optimization of a Variable and its Application

open access: yesRevista Colombiana de Estadística, 2014
An iterative method for the adjustment of curves is obtained by applying the least squares method reiteratively in functional subclasses, each defined by one parameter, after assigning values to the rest of the parameters which determine a previously ...
ROGELIO ACOSTA   +4 more
doaj   +1 more source

MAIN CONTRACTOR – SUBCONTRACTOR RELATIONS IN THE FRAMEWORK OF CONTRACT THEORY [PDF]

open access: yesBaltic Journal of Economic Studies, 2018
The purpose of this paper is to study optimal relationships between customer, main contractor, and subcontractor. We make the following assumptions: main contractor and subcontractor have types that specify expenses and outcomes for all actions that can ...
Iryna Nykyforchyn, Nataliia Suduk
doaj   +1 more source

Treatment of a Coupled System for Quadratic Functional Integral Equation on the Real Half-Line via Measure of Noncompactness

open access: yesFoundations, 2023
This article is devoted to the solvability and the asymptotic stability of a coupled system of a functional integral equation on the real half-axis. Our consideration is located in the space of bounded continuous functions on R+(BC(R+)). The main tool applied in this work is the technique associated with measures of noncompactness in BC(R+) by a given ...
Ahmed M. A. El-Sayed   +3 more
openaire   +2 more sources

Existence of solutions for some classes of integro-differential equations via measure of noncompactness

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2015
In this present paper, we introduce a new measure of noncompactness on the space consisting of all real functions which are $n$ times bounded and continuously differentiable on $\mathbb{R}_+$.
Reza Allahyari   +2 more
doaj   +1 more source

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