J. Indones. Math. Soc.
Vol. 17, No. 2 (2011), pp. 123–128.INSTABILITY FOR A CERTAIN FUNCTIONAL
DIFFERENTIAL EQUATION OF SIXTH ORDER
Cemil Tunc
¸
Department of Mathematics, Faculty of Sciences, Y¨
uz¨
unc¨
u Yıl University,
65080, Van -Turkey, cemtunc@yahoo.com
Abstract.Sufficient conditions are obtained for the instability of the zero solution of a certain sixth order nonlinear functional differential equation by the Lyapunov-Krasovskii functional approach.
Key words: Instability, Lyapunov-Krasovskii functional, delay differential equation, sixth order.
2000 Mathematics Subject Classification: 34K20.