On the existence of periodic solutions for Liénard type $\phi$-Laplacian equation

Abstract

In this paper, we study the existence of periodic solutions for a Liénard type $\phi$-Laplacian equation $$ (\phi(x'))'+f(x)x'+g(x)=p(t). $$ We prove a continuation lemma and use it to prove the existence of periodic solutions for above equation when $g$ or $G$ (the primitive of $g$) satisfies some one-sided or bilateral growth conditions and $F$ (the primitive of $f$) satisfies sublinear condition.