Tang, Chun-Lei Periodic solutions for nonautonomous second order systems with sublinear nonlinearity. (English) Zbl 0902.34036 Proc. Am. Math. Soc. 126, No. 11, 3263-3270 (1998). 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. Cited in 2 ReviewsCited in 121 Documents MSC: 34C25 Periodic solutions to ordinary differential equations 58E50 Applications of variational problems in infinite-dimensional spaces to the sciences Keywords:coercive; the (PS) condition; Sobolev’s inequality; Wirtinger’s inequality; the least action principle; the saddle point theorem; periodic solutions PDFBibTeX XMLCite \textit{C.-L. Tang}, Proc. Am. Math. Soc. 126, No. 11, 3263--3270 (1998; Zbl 0902.34036) Full Text: DOI