讨论了一类二阶非线性泛函微分方程的振动性，得到一些新的振动准则。

The oscillation of a class of second-order nonlinear functional differential equations is discussed, and some new oscillation criteria for the equations are obtained.

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本文证明了关于对称泛函临界点的一个定理并用以研究非线性椭园型偏微分方程的多重解。

In this paper we prove a theorem for the critical points of symmetric functionals through which we research the multiple solutions of nonlinear elliptic PDE.

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研究了一类非线性滞后型泛函微分方程周期解的存在性问题。

The existence problem for a class of nonlinear retarded functional differential equation is researched.

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