On the existence of periodic solution of perturbed generalized Liénard equations

Islam Boussaada, A. Raouf Chouikha

Under conditions of Levinson-Smith type, we prove the existence of a $\tau$-periodic solution for the perturbed generalized Liénard equation u''+ϕ(u,u')u'+ψ(u)=εω(\frac{t}τ,u,u') with…