Resumen de Center Conditions for Polynomial Liénard Systems
In this paper we study the center problem for polynomial Liénard systems of degree n with damping of degree n. Computing the focal values we find the center conditions for such systems for n = 5 and using modular arithmetics and Gröbner bases for n = 6. We also give some center conditions for polynomial Liénard systems of degree n with damping of degree n.
