| 1. | Periodic solution for a class of duffing equations
一类高阶时滞微分方程的周期解 |
| 2. | Existence of periodic solutions of generalized duffing equation
方程周期解的存在性 |
| 3. | Periodic solution for a class of duffing equations with delay
一类时滞微分方程的周期解 |
| 4. | Exact multiple results of duffing equation
方程的唯三周期解问题 |
| 5. | Boundedness of solutions for duffing equations with asymmetric superlinear restoring terms
方程解的有界性 |
| 6. | Existence and uniqueness of almost periodic solution of duffing equation with delay
型方程概周期解的存在唯一性 |
| 7. | The existence and uniqueness of odd - harmonic solutions for second order crossing resonance duffing equations
方程奇调和解的存在性和唯一性 |
| 8. | At last we apply the results to a kind of fourth order elliptic boundary value problem and duffing equation
最后我们将所得结论应用到一类四阶椭圆型微分方程和duffing方程，给出了它们的解存在唯一的一些结果。 |
| 9. | Many studies have been carried out on the system described by duffing equation ( 2 ) , but very few on equation ( 1 ) by using the analytical method
前人对duffing方程( 2 )描述的系统进行了许多研究，但很少见到用解析方法研究方程( 1 ) 。 |
| 10. | In the last chapter , by means of the coincidence degree theory , we investigate the existence of periodic solutions for the duffing equation with impulses and delays , and some sufficient conditions will be established , which are new even for case without impulsive point
第三章讨论了脉冲时滞的duffing型方程周期解的存在性，经过利用重合度理论，建立了一系列解存在的充分条件，这些结果即使没有脉冲点也是新的。 |
