In this paper we study the maximum number of limit cycles that can bifurcate from the period annulus surrounding the origin of a class of cubic polynomial differential systems using the averaging method. More precisely, we prove that the perturbations of the period annulus of the center located at the origin of the cubic polynomial differential system over(x, ̇) = - y f (x, y), over(y, ̇) = x f (x, y), where f (x, y) = 0 is a conic such that f (0, 0) ≠ 0, by arbitrary cubic polynomial differential systems provide at least six limit cycles bifurcating from the periodic orbits of the period annulus using only the first order averaging method. © 2006 Elsevier Ltd. All rights reserved.
|Journal||Nonlinear Analysis, Theory, Methods and Applications|
|Publication status||Published - 15 Apr 2007|
- Abelian integral
- Averaging method
- Bifurcation from a center
- Limit cycle