Abstract
We study the oscillator ddot{x} + n^2 x + h(x) = p(t), where h is a piecewise linear saturation function and p is a continuous 2pi -periodic forcing. It is shown that there is recurrence if and only if p satisfies the Lazer–Leach condition. This condition relates the n-th Fourier coefficient of p(t) with the maximum of h and was first introduced to characterize the existence of periodic solutions.
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