Stable of solutions of delay differential equations

الملخص EN

-In the paper , we will obtain a characterization of oscillation of behavior of even order delay equation and consider some related results and then apply these results to deduce the oscillation properties of slightly more general delay equation in which the lag term ԏ(t -ԏ) is such that ԏ=ԏ(t) a function of ԏ.

We will generalize some results already known in [2] for the oscillation properties.