周期边值问题是非线性分析中的一个重要问题.作者借助广义Green函数,研究了二阶周期边值问题{u′′(t)+λu(t)=f(t,u(t)),0〈t〈1,u(0)=u(1),u′(0)=u′(1),的广义Green函数和其可解性,其中λ为其对应齐次问题的特征值,f:[0,1]×R→R连续.
Periodic bounduy value problems is an important topic in nonlinear analysis.In this paper,existences of both solution and generalized Green function are studied for the following second-order periodic boundary value problems:{u′′(t)+λu(t)=f(t,u(t)),0t1,u(0)=u(1),u′(0)=u′(1),whereλis eigenvalue of the corresponding homogeneous problem,f:[0,1]×R→Ris continuous.