The existence of periodic solutions is proved for the higher order nonlinear differential equation by applying Leray-Schauder principle and Wirtinger＇s inequality.
基金This work was supported by NNSF of China. (No.10371006)
文摘The existence of periodic solutions is proved for the higher order nonlinear differential equation by applying Leray-Schauder principle and Wirtinger＇s inequality.
