Abstract
We consider a second order periodic problem with resonance both at infinity and at zero. Combining variational methods together with Morse theory, we produce six nontrivial solutions for the periodic problem.
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Barletta, G., Papageorgiou, N.S. Periodic problems with double resonance. Nonlinear Differ. Equ. Appl. 19, 303–328 (2012). https://doi.org/10.1007/s00030-011-0130-5
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DOI: https://doi.org/10.1007/s00030-011-0130-5