Address.
Mathematics Department, Faculty of
Science, Assiut University,
71516 Assiut, Egypt
E-mail. sadeka1961@hotmail.com
Abstract.
Our aim in this paper is to present sufficient conditions under which all
solutions of (1.1) tend to zero as $t \to \infty$.
AMSclassification. 34C, 34D.
Keywords. Asymptotic stability, Lyapunov function, nonautonomous differential equations of fifth order.