Tunc, Cemil2025-05-102025-05-1020090924-090X10.1007/s11071-008-9423-62-s2.0-67549085265https://doi.org/10.1007/s11071-008-9423-6https://hdl.handle.net/20.500.14720/9892Tunc, Cemil/0000-0003-2909-8753This paper investigates stability and boundedness of solutions to third order nonlinear differential equation with retarded argument: x'''(t)+ phi (x(t-r), x'(t-r), x ''(t-r))x '' (t) + psi(x'(t-r)) + h(x(t-r)) = p(t, x(t), x(t-r), x'(t), x'(t-r), x ''(t)). 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.eninfo:eu-repo/semantics/closedAccessStabilityBoundednessLyapunov FunctionalThird Order Nonlinear DifferentialArticle