On the averaging method for differential equations with delay.
We apply the averaging method to ordinary differential inclusions with maxima perturbed by a small parameter and illustrate the method by some examples.
In this paper, we discuss the conditions for a center for the generalized Liénard system or with , , , , , , and for . By using a different technique, that is, by introducing auxiliary systems and using the differential inquality theorem, we are able to generalize and improve some results in [1], [2].