On the Instability of Solutions of Seventh Order Nonlinear Delay Differential Equations

Abstract

A kind of seventh order nonlinear delay differential equations is con-sidered. By using the Lyapunov-Krasovskii functional approach [5], some sufficient conditions are established which guarantee that the zero solution of the equation considered is unstable. Our conditions are new and supplement previously known results. © Cemil Tunç, 2011.