AbstractGeneral conditions guaranteeing the nonnegativity of solutions of delay differential equations are proposed. Some examples when the nonnegativity is not preserved in time are given. The nonnegativity of solutions of the logistic equation with time delay is considered. Behaviour like in discrete time case is observed
AbstractSufficient conditions are derived for the nonexistence of positive solutions of a class of p...
AbstractSufficient conditions for the existence of nonoscillatory solutions to the delay logistic eq...
AbstractFor the delay differential equation[formula]a connection between the following properties is...
Abstract. Models with a time delay often occur, since there is a naturally occurring delay in the tr...
AbstractThe present paper is the first step in the systematic study of differences and similarities ...
We study the exact and approximate solutions of a delay differential equation with var-ious types of...
It is noteworthy to observe that a first-order linear ordinary differential equation without delay ...
We study a linear delay differential equation with a single positive and a single negative term. We ...
AbstractIn this article we study oscillation and nonoscillation of the solutions of linear delay dif...
AbstractIn this note we demonstrate the existence of linear delay differential equations whose solut...
AbstractWe obtain a sufficient condition for the persistence of nonoscillatory solutions of the dela...
Não disponívelThis work is essentially diuided in two parts. In the first part we introduce the conc...
AbstractIt is known that the general solution of a linear delay differential equation is given by th...
AbstractThis paper deals with asymptotic behavior of solutions of the nonlinear nonautonomous delay ...
Deterministic dynamical system models with delayed feedback and nonnegativity constraints arise in a...
AbstractSufficient conditions are derived for the nonexistence of positive solutions of a class of p...
AbstractSufficient conditions for the existence of nonoscillatory solutions to the delay logistic eq...
AbstractFor the delay differential equation[formula]a connection between the following properties is...
Abstract. Models with a time delay often occur, since there is a naturally occurring delay in the tr...
AbstractThe present paper is the first step in the systematic study of differences and similarities ...
We study the exact and approximate solutions of a delay differential equation with var-ious types of...
It is noteworthy to observe that a first-order linear ordinary differential equation without delay ...
We study a linear delay differential equation with a single positive and a single negative term. We ...
AbstractIn this article we study oscillation and nonoscillation of the solutions of linear delay dif...
AbstractIn this note we demonstrate the existence of linear delay differential equations whose solut...
AbstractWe obtain a sufficient condition for the persistence of nonoscillatory solutions of the dela...
Não disponívelThis work is essentially diuided in two parts. In the first part we introduce the conc...
AbstractIt is known that the general solution of a linear delay differential equation is given by th...
AbstractThis paper deals with asymptotic behavior of solutions of the nonlinear nonautonomous delay ...
Deterministic dynamical system models with delayed feedback and nonnegativity constraints arise in a...
AbstractSufficient conditions are derived for the nonexistence of positive solutions of a class of p...
AbstractSufficient conditions for the existence of nonoscillatory solutions to the delay logistic eq...
AbstractFor the delay differential equation[formula]a connection between the following properties is...
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