Tunc, Cemil2025-05-102025-05-1020111842-65732-s2.0-80053901832https://hdl.handle.net/20.500.14720/16839Tunc, Cemil/0000-0003-2909-8753This paper considers a fifth order nonlinear differential equation with a constant delay. Some sufficient conditions for the instability of the zero solution are established, which are new and complement previously known results.eninfo:eu-repo/semantics/closedAccessInstabilityLyapunov-Krasovskii FunctionalDelay Differential EquationFifth OrderArticle