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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 the famous Benci-Rabinowitz’s Saddle Point Theorem ([3])with
Cerami-Palais-Smale condition to study the existence of new periodic solutions with
a fixed period for second order Hamiltonian systems under weaker conditions than
Rabinowitz’s original conditions in his pioneer paper([11]),the key point of our proof
is proving Cerami-Palais-Smale condition,which is difficult since no symmetry for the
potential. We use Rabinowitz’s Saddle Point Theorem to study periodic solution for
sub-quadratic second order Hamiltonian systems.
Keywords:Second order Hamiltonian systems;Periodic solutions;Saddle Point Theorems