Copyright © 2010 Taiyong Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The existence of antiperiodic solutions for Liénard-type and Duffing-type differential equations with p-Laplacian operator has been studied by using degree theory. The results obtained improve and enrich some known works to some extent.