Abstract
In this paper we are concerned with the existence of invariant curves of planar twist map**s which are almost periodic in a spatial variable. As an application of this result to differential equations we will prove the existence of almost periodic solutions and the boundedness of all solutions for superlinear Duffing’s equation with an almost periodic external force.
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Huang, P., Li, X. & Liu, B. Invariant Curves of Almost Periodic Twist Map**s. J Dyn Diff Equat 34, 1997–2033 (2022). https://doi.org/10.1007/s10884-021-10033-1
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DOI: https://doi.org/10.1007/s10884-021-10033-1