Oscillation Criteria for Nonlinear Delay Differential Equation

The differential equations occupy a high position in science and play a significant role in the physical engineering and chemical sciences. There were research interests on the subject of oscillation of solutions of differential equations with delay because of the importance of this type of equations in different reality applications. The main objective of this work is to shed light on many equations of fourth and higher order through studying the oscillation of solutions of those equations by different methods and comparison of results. We discussed in detail the oscillation of fourth and higher-order nonlinear delay differential equations.