Some sufficient conditions for the existence of periodic solutions of the equation are obtained by using the theory of critical point in functional.

再利用泛函的临界点理论，得到了方程具有周期解的充分条件。

youdao

Some sufficient conditions for the existence of periodic solutions of the equation are obtained by using the theory of critical point in functional.

再利用泛函的临界点理论，得到了方程具有周期解的充分条件。

youdao