具有Landesman-Lazer型条件的二阶不对称非线性方程的周期边值问题的周期解

Periodic Solutions to the Periodic Boundary Value Problem of the 2nd Order Scalar Differential Equation with Asymmetric Nonlinearities Satisfying Landesman-Lazer Conditions

本文对纯量这值问题其中x″＋f（x）x′＋g（t，x）＝0x（2π）－x（0）＝0，x′（2π）－x′（0）＝0其中f（0）＝c，x≥0，＝d，x≤0。给出了存在周期解的Landesmen－Lazer型条件。

In this paper, the author gives the existence conditions of the Landesman-Lazer typeof periodic solution to the scalar boundary value problemwhere