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Periodic solutions of x”+f(x,t)=0 via the Poincaré-Birkhoff theorem. (English) Zbl 0285.34028

##### MSC:
 34C25 Periodic solutions to ordinary differential equations 37-XX Dynamical systems and ergodic theory
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##### References:
 [1] Birkhoff, G.D; Birkhoff, G.D, An extension of Poincaré’s last geometric theorem, (), 47, 252-266, (1925) [2] Birkhoff, G.D, Dynamical systems, (1927), American Mathematical Society New York · Zbl 0171.05402 [3] Coddington, E; Levinson, N, Theory of ordinary differential equations, (1955), McGraw-Hill New York · Zbl 0064.33002 [4] Morris, G.R, An infinite class of periodic solutions of $$ẍ + 2x\^{}\{3\} = p(t)$$, (), 157-164 · Zbl 0134.07203 [5] Moser, J, () [6] Nehari, Z, Characteristic values associated with a class of nonlinear second-order differential equations, Acta math., 105, 141-175, (1961) · Zbl 0099.29104 [7] Rabinowitz, P, Some aspects of nonlinear eigenvalue problems, Rocky mountain J. math., 3, 161-202, (1973) · Zbl 0255.47069 [8] Wolkowisky, J, Branches of periodic solutions of the nonlinear Hill’s equation, J. differential equations, 11, 385-400, (1972) · Zbl 0217.12101
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