证明了极限环和周期解的存在性。

The existence of a limit cycle was proved.

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本文讨论渐近线性强迫波方程周期解的存在性。

In this paper we discuss the existence of solution of an asymptotically linear wave equation.

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用泛函的方法研究一类二阶微分方程周期解的存在性。

We studied a class of two order differential equations by means of the functional method.

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