Periodic solutions of second order differential equations with vanishing Green's functions

Fang-Fang Liao
2017 Electronic Journal of Qualitative Theory of Differential Equations  
We study the existence and multiplicity of positive periodic solutions for second order differential equations with vanishing Green's functions. The proof relies on a fixed point theorem in cones. Some recent results in the literature are generalized.
doi:10.14232/ejqtde.2017.1.55 fatcat:e3steip5yfax3e35sxxm74wc4q