Abstract
We prove existence and multiplicity results for periodic solutions of time dependent and time independent Hamiltonian equations, which are assumed to be asymptotically linear. The periodic solutions are found as critical points of a variational problem in a real Hilbert space. By means of a saddle point reduction this problem is reduced to the problem of finding critical points of a function defined on a finite dimensional subspace. The critical points are then found using generalized Morse theory and minimax arguments.
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Amann, H., Zehnder, E. Periodic solutions of asymptotically linear Hamiltonian systems. Manuscripta Math 32, 149–189 (1980). https://doi.org/10.1007/BF01298187
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DOI: https://doi.org/10.1007/BF01298187