Abstract
We consider the periodically forcedN-pendulum equation. Forced oscillations are obtained, and their multiplicity is studied in terms of the mean value of the forcing term.
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Communicated by T. Spencer
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Tarantello, G. Multiple forced oscillations for theN-pendulum equation. Commun.Math. Phys. 132, 499–517 (1990). https://doi.org/10.1007/BF02156533
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DOI: https://doi.org/10.1007/BF02156533