Cuantificacion del metodo de poincare para osciladores no lineales.

In the sixties, W. Loud obtains interesting results of continuation in driven nonlinear differential equations of second order with small parameter [5]. In this research we want to use the Loud’s results for study the periodically driven Duffing equation with odd symmetry, quantifying the continuation parameter for a periodic odd solution which is elliptic and emanating from the equilibrium of the unperturbed problem.