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Subharmonics of non-autonomous second order systems. (Chinese. English summary) Zbl 0865.34036

Summary: We consider subharmonic solutions for a class of nonautonomous second-order systems. The main result is that, under some suitable assumptions, there exists a sequence of periodic solutions of the systems such that at most finitely many minimal periods ar equal.

MSC:

34C25 Periodic solutions to ordinary differential equations
34C20 Transformation and reduction of ordinary differential equations and systems, normal forms
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