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 |