Rotating periodic integrable solutions for second-order differential systems with nonresonance condition

In this paper, by using Parseval’s formula and Schauder’s fixed point theorem, we prove the existence and uniqueness of rotating periodic integrable solution of the second-order system x ′′ + f(t, x) = 0 with x(t + T) = Qx(t) and ∫ kT (k−1)T x(s)ds = 0, k ∈ Z + for any orthogonal matrix Q when the nonlinearity f satisfies nonresonance condition.

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