Periodic solutions for second-order differential equations with a singular nonlinearity Original Research Article

This paper deals with the existence of positive TT-periodic solutions for the following differential equation View the MathML sourceẍ+a(t)x=f(t,x)+c(t), Turn MathJax on where aa, c∈L1[0,T]c∈L1[0,T] and View the MathML sourcef∈Car([0,T]×R+,R). The existence results are obtained by using a fixed point theorem in cones.