1. Fourth-Order Neutral Differential Equation: A Modified Approach to Optimizing Monotonic Properties.
- Author
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Nabih, Amany, Moaaz, Osama, Askar, Sameh S., Alshamrani, Ahmad M., and Elabbasy, Elmetwally M.
- Subjects
DIFFERENTIAL equations ,FUNCTIONAL differential equations - Abstract
In this article, we investigate some qualitative properties of solutions to a class of functional differential equations with multi-delay. Using a modified approach, we first derive a number of optimized relations and inequalities that relate the solution x s to its corresponding function z s and its derivatives. After classifying the positive solutions, we follow the Riccati approach and principle of comparison, where fourth-order differential equations are compared with first-order differential equations to obtain conditions that exclude the positive solutions. Then, we introduce new oscillation conditions. With regard to previous relevant results, our results are an extension and complement to them. This work has theoretical significance in that it uncovers some new relationships that aid in developing the oscillation theory of higher-order equations in addition to the applied relevance of neutral differential equations. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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