Periodic solutions of second order singular coupled systems Original Research Article

We establish the existence of periodic solutions for the second order non-autonomous singular coupled systems View the MathML source{x″+a1(t)x=f1(t,y(t))+e1(t),y″+a2(t)y=f2(t,x(t))+e2(t). Turn MathJax on The proof relies on Schauder’s fixed point theorem. Some recent results in the literature are generalized and improved.