Abstract
Second-order linear Hamiltonian systems at resonance with periodic nonlinearity is investigated. An existence result of solutions for such systems is obtained by means of variational methods, saddle point theorem, and an index theory for second-order linear Hamiltonian systems. Meanwhile, two examples and two extensions are presented.
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Bu, Y. Periodic Perturbations of Linear Systems at Resonance. Indian J Pure Appl Math 50, 225–238 (2019). https://doi.org/10.1007/s13226-019-0320-0
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DOI: https://doi.org/10.1007/s13226-019-0320-0