Three Solutions for Forced Duffing-Type Equations with Damping Term
Department of Mathematics, Yunnan University, Kunming, Yunnan 650091, China
Boundary Value Problems 2011, 2011:736093 doi:10.1155/2011/736093Published: 10 March 2011
Using the variational principle of Ricceri and a local mountain pass lemma, we study the existence of three distinct solutions for the following resonant Duffing-type equations with damping and perturbed term , a.e. , and without perturbed term , a.e. , .