Results 11 to 20 of about 2,146,074 (336)
Algebraic Systems with Positive Coefficients and Positive Solutions
Mathematics, 2022 The paper is devoted to the existence, uniqueness and nonuniqueness of positive solutions to nonlinear algebraic systems of equations with positive coefficients. Such systems appear in large numbers of applications, such as steady-state equations in continuous and discrete dynamical models, Dirichlet problems, difference equations, boundary value ...
Ana Maria Acu +2 more
openaire +2 more sources
Positive Solution For Eigen value Problems [PDF]
مجلة جامعة الانبار للعلوم الصرفة, 2010 Studying the boundary value problem :- Values of the parameter ( ) are determined for which this problem has a positive solution. The methods used here extend recent works by a simple application of a Fixed Point Theorem in cones . I show the existence
Saleh . M . Hussein
doaj +1 more source
On the Positive Solutions of a Model System of Nonlinear Ordinary Differential Equations [PDF]
Известия Саратовского университета. Новая серия. Серия Математика. Механика. Информатика, 2020 This article investigates the properties of positive solutions of a model system of two nonlinear ordinary differential equations with variable coefficients.
Kobilzoda, Mirzoodil Mirzomalik +1 more
doaj +1 more source
On the existence of positive periodic solutions for totally nonlinear neutral differential equations of the second-order with functional delay [PDF]
Opuscula Mathematica, 2014 We prove that the totally nonlinear second-order neutral differential equation \[\frac{d^2}{dt^2}x(t)+p(t)\frac{d}{dt}x(t)+q(t)h(x(t))\] \[=\frac{d}{dt}c(t,x(t-\tau(t)))+f(t,\rho(x(t)),g(x(t-\tau(t))))\] has positive periodic solutions by employing the ...
Emmanuel K. Essel, Ernest Yankson
doaj +1 more source
On the positivity of solutions of systems of stochastic PDEs [PDF]
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2012 AbstractWe study the positivity of solutions of a class of semi‐linear parabolic systems of stochastic partial differential equations by considering random approximations. For the family of random approximations we derive explicit necessary and sufficient conditions such that the solutions preserve positivity.
Messoud Efendiev +3 more
openaire +5 more sources
Solutions and positive solutions for superlinear Robin problems [PDF]
Journal of Mathematical Physics, 2019 We consider nonlinear, nonhomogeneous Robin problems with a (p − 1)-superlinear reaction term, which need not satisfy the Ambrosetti-Rabinowitz condition. We look for positive solutions and prove existence and multiplicity theorems. For the particular case of the p-Laplacian, we prove existence results under a different geometry near the origin.
N. S. Papageorgiou, C. Vetro, F. Vetro
openaire +3 more sources
Positive Solutions of Advanced Differential Systems [PDF]
The Scientific World Journal, 2013 We study asymptotic behavior of solutions of general advanced differential systems , where F : Ω → ℝn is a continuous quasi‐bounded functional which satisfies a local Lipschitz condition with respect to the second argument and Ω is a subset in , , yt∈, and yt(θ) = y(t + θ), θ ∈ [0, r]. A monotone iterative method is proposed to prove the existence of a
Mária Kúdelčíková, Josef Diblík
openaire +4 more sources
Global existence of positive and negative solutions for IFDEs via Lyapunov-Razumikhin method
Mathematical Modelling and Control, 2021 This paper considers the global existence of positive and negative solutions for impulsive functional differential equations (IFDEs). First, we introduce the concept of ε-unstability to IFDEs and establish some sufficient conditions to guarantee the ε ...
Xipu Xu
doaj +1 more source
Existence of a positive solution for a singular system [PDF]
Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 2010 We show the existence and non-existence of positive solutions to a system of singular elliptic equations with the Dirichlet boundary condition.
Da Silva Montenegro, Marcelo +1 more
openaire +2 more sources
Nonlinear Analysis, 2018 In this article, we study a class of nonlinear fractional differential equations with mixed-type boundary conditions. The fractional derivatives are involved in the nonlinear term and the boundary conditions. By using the properties of the Green function,
Fang Wang +3 more
doaj +1 more source