Tunc, Cemil2025-05-102025-05-1020122337-576010.5614/itbj.sci.2012.44.3.42-s2.0-84871792732https://doi.org/10.5614/itbj.sci.2012.44.3.4https://hdl.handle.net/20.500.14720/1324Tunc, Cemil/0000-0003-2909-8753In this paper, we study the instability properties of solutions of a kind of functional differential equations of the fifth order with constant delay. Using the Lyapunov-Krasovskii functional approach, we obtain certain sufficient conditions to guarantee that the zero solution of the equation is unstable.eninfo:eu-repo/semantics/openAccessFifth OrderFunctional Differential EquationInstabilityLyapunov-Krasovskii FunctionalArticle