2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/68195We consider the Liénard equation and we give a sufficient condition to ensure existence and uniqueness of limit cycles. We compare our result with some other existing ones and we give some applications.submitted to Journal Mathematical Analysis and ApplicationsClassical Analysis and ODEs34CxxA note on existence and uniqueness of limit cycles for Liénard systemstext