Periodic solutions for prescribed mean curvature Liénard equation with a deviating argument

Using coincidence degree theory and different techniques from those used by N. Các, this paper is devoted to study the existence of periodic solutions for a prescribed mean curvature Liénard equation with a deviating argument (x′1+x′2)′+f(x(t))x′(t)+g(t,x(t−τ(t)))=e(t), where g∈C(R2,R1),f,e and ττ are TT-periodic. The results are illustrated with an example, which cannot be handled using the existing results.