Existence and Multiplicity of Periodic solutions for the Non-autonomous Second-order Hamiltonian Systems

一类非自治二阶哈密顿系统周期解的存在性和多重性（英文）

In this paper,we study the existence and multiplicity of periodic solutions of the non-autonomous second-order Hamiltonian systems■where T> 0.Under suitable assumptions on F,some new existence and multiplicity theorems are obtained by using the least action principle and minimax methods in critical point theory.