Asymptotic behaviour of the solutions of a certain type of the third order differential equations
Asymptotic forms of solutions of half-linear ordinary differential equation are investigated under a smallness condition and some signum conditions on . When , our results reduce to well-known ones for linear ordinary differential equations.
We study the asymptotic behavior of the solutions of a differential equation with unbounded delay. The results presented are based on the first Lyapunov method, which is often used to construct solutions of ordinary differential equations in the form of power series. This technique cannot be applied to delayed equations and hence we express the solution as an asymptotic expansion. The existence of a solution is proved by the retract method.