Periodic solutions for nonautonomous second-order systems with bounded nonlinearity. (English) Zbl 0922.34039

It is studied a class of nonautonomous second-order systems of ordinary differential equations with bounded nonlinearity. By means of minimax methods, some existence and multiplicity results are obtained.


34C25 Periodic solutions to ordinary differential equations
34A34 Nonlinear ordinary differential equations and systems
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