Existence of periodic solutions for nonlinear Lienard systems
Wan Se Kim1
Received26 Jan 1993
Revised29 Mar 1993
Abstract
We prove the existence and multiplicity of periodic solutions for nonlinear Lienard
System of the type
x″(t)+ddt[∇F(x(t))]+g(x(t))+h(t,x(t))=e(t)
under various conditions upon the functions g, h and e.