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Periodic solutions for nonautonomous second order systems with sublinear nonlinearity. (English) Zbl 0902.34036

Summary: The existence and multiplicity of periodic solutions are obtained for nonautonomous second-order systems with sublinear nonlinearity by using the least action principle and the minimax method.

MSC:

34C25 Periodic solutions to ordinary differential equations
58E50 Applications of variational problems in infinite-dimensional spaces to the sciences
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