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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用差分法证明了其周期解的存在性；

The existence of periodical solutions is proved by the difference method;

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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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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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