In this paper, we give an instability criteria for the nonlinear sixth-order vector differential equation
The result extends and includes earlier results [6,16,20].
Submitted July 13, 2004. Published October 7, 2004.
Math Subject Classifications: 34D05, 34D20.
Key Words: Nonlinear differential equations of sixth order; instability; Lyapunov function.
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| Cemil Tunç|
Department of Mathematics
Faculty of Arts and Sciences
Yüzüncü Yil University
65080, VAN -- Turkey
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