利用一个著名的不动点指标定理，获得了该方程周期正解的存在性、多重性和不存在性。

By using a well-known fixed point index theorem, we obtain the existence, multiplicity and nonexistence of positive periodic solution(s) to this equation.

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利用一个著名的不动点指标定理，获得了该方程周期正解的存在性、多重性和不存在性。

By using a well-known fixed point index theorem, we obtain the existence, multiplicity and nonexistence of positive periodic solution(s) to this equation.

youdao