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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
We use saddle point theorems of Benci-Rabinowitz and Silva to study
the existence of periodic solutions with a fixed energy for a few second order Hamiltonian
conservative systems without any symmetry,the key difficulty of the proof is proving Palais-Smale condition and the nonconstant property for the minimax critical point.
Keywords:Second order Hamiltonian systems;Periodic solutions;Saddle point theorems