A "Birkhoff-Lewis" type result for a class of Hamiltonian systems.
Vieri Benci, Donato Fortunato (1987)
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Vieri Benci, Donato Fortunato (1987)
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Two theorems about the existence of periodic solutions with prescribed energy for second order Hamiltonian systems are obtained. One gives existence for almost all energies under very natural conditions. The other yields existence for all energies under a further condition.
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