This paper investigates stability and boundedness of solutions to third order nonlinear differential equation with retarded argument:By the use of the Lyapunov functional, sufficient conditions for stability and boundedness of solutions to the considered equations are obtained. Examples are introduced throughout the paper for illustrations.Keywords Stability · Boundedness · Lyapunov functional · Third order nonlinear differential
IntroductionIt is well known that the systems with after-effect, with time lag or with delay are of great theoretical interest and form an important class, as regards their applications. This class of systems is described by functional differential equations, which are also called differential equations with deviating arguments.C. Tunç ( )