On the instability of solutions of an eighth order nonlinear differential equation of retarded type

• Tunç, Cemil ^[1]
  1. [1] Yüzüncü Yıl University

     Yüzüncü Yıl University

     Turquía

     
• Localización: Proyecciones: Journal of Mathematics, ISSN 0716-0917, ISSN-e 0717-6279, Vol. 30, Nº. 1, 2011, págs. 43-50
• Idioma: inglés
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• Resumen

  • In this paper, we give some sufficient conditions on the instability of the zero solution of a kind of eighth order nonlinear differential equations of retarded type by using the Lyapunov direct method. The obtained sufficient conditions improve an existing result in the literature.