Tunc, Cemil2025-05-102025-05-1020071201-33902-s2.0-34247273124https://hdl.handle.net/20.500.14720/17640This work presents new results about the instability of zero solution of some certain non-linear ordinary vector differential equations of sixth and seventh orders. Namely, we improve some well-known instability results into certain nonlinear ordinary vector differential equations of sixth and seventh orders [20].eninfo:eu-repo/semantics/closedAccessNonlinear Differential EquationsSixth OrderSeventh OrderInstabilityLyapunov'S Second MethodArticle