Summary
In this paper, we prove the existence of periodic solutions of some second order damped nonlinear differential equations with forcing term. In many cases, our results are, in a sense, best possible.
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Entrata in Redazione il 28 settembre 1977.
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Dancer, E.N. On the ranges of certain damped nonlinear differential equations. Annali di Matematica 119, 281–295 (1979). https://doi.org/10.1007/BF02413183
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DOI: https://doi.org/10.1007/BF02413183