Thirdly, we consider the n-dimensional Duffing type equation with damping term. By virtue of homeomorphism, extension and fixed point method, we discuss the existence of periodic solution under the nonresonance condition.
再次，我们考虑n维的带有阻尼项的Duffing型方程，运用同胚延拓及不动点方法，讨论了非共振条件下周期解的存在性问题。
参考来源 - Liénard方程和非共振Duffing方程研究·2,447,543篇论文数据，部分数据来源于NoteExpress
在某些条件下，利用不动点方法和平均值法证明了这类方程系具有概自守解。
Under certain condition, these systems are proved by fixed point method and mean value method to have almost-automorphic solution.
所用的技巧主要是建立在线性抛物系统的唯一连续性和不动点方法的基础上。
The techniques used here are based on the unique continuation of linear parabolic systems arid the fixed point theorem.
利用不动点方法及对差分方程构造概周期解，获得了概周期解存在的充分条件。
By using fixed point theorem and constructing almost periodic sequence solution for difference equation, the authors get the sufficient conditions for the existence of the almost periodic solution.
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