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| EXISTENCE OF PERIODIC SOLUTIONS OF A CLASS OF SECOND-ORDER NON-AUTONOMOUS SYSTEMS |
| Yuan Qi,Kun Liu |
| (College of Math. and Statistics, Longdong University, Gansu 745000, PR China) |
| DOI： |
| Abstract: |
| In this paper, we are concerned with the existence of periodic solutions of second-order non-autonomous systems. By applying the Schauder's fixed point theorem and Miranda's theorem, a new existence result of periodic solutions is established. |
| Key words: second-order non-autonomous systems; periodic solutions; Schauder's fixed point theorem; Miranda's theorem |