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A Simplified Proof to a Theorem by Ding Tong-Ren on Periodic Solutions of Duffing Equations |
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| Authors: | Yu-jun Dong |
| Institution: | Department of Mathematics, Nanjing Normal University, Nanjing 210097, P R China;Nankai Institute of Mathematics, Nankai University, Tianjin 300071, P R China |
| Abstract: | In 1982, DING Tong_ren gave a basic theorem about existence of periodic solutions of Duffing equations with double resonance. A simplified proof will be given by making use of the Leray_Schauder principle. |
| Keywords: | periodic solutions Duffing equations Leray_Schauder principle |
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