A SIMPLIFIED PROOF TO A THEOREM BY DING TONG-REN ON PERIODIC SOLUTIONS OF DUFFING EQUATIONS
DONG Yu-jun1,2
1. Department of Mathematics, Nanjing Normal University, Nanjing 210097, P R China;
2. Nankai Institute of Mathematics, Nankai University, Tianjin 300071, P R China
DONG Yu-jun. A SIMPLIFIED PROOF TO A THEOREM BY DING TONG-REN ON PERIODIC SOLUTIONS OF DUFFING EQUATIONS. Applied Mathematics and Mechanics (English Edition), 2001, 22(9): 1105-1108.
[1] DING Tong-ren. Nonlinear oscillations at a point of resonance[J]. Science of China Section A,1982,12(1):1-13.
[2] Habets P, Metzen G. Existence of periodic solutions of Duffing equations[J]. J Differential Equations,1989,78(1):1-32.
[3] Asakawa H. Landesman-Lazer type problems for Fucik spectrum[J]. Nonlinear Anal,1996,26(3):407-414.
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