Browsing by Author "Aziz, Waleed"
Aziz, Waleed; Llibre Saló, Jaume; Pantazi, Chara (2014-03-20)
Restricted access - publisher's policyWe characterize the centers of the quasi-homogeneous planar polynomial differential systems of degree three. Such systems do not admit isochronous centers. At most one limit cycle can bifurcate from the periodic orbits of ...
Pantazi, Chara; Amen, Azad; Aziz, Waleed (2021-01-01)
Open AccessWe consider a three-dimensional vector field with quadratic nonlinearities and in general none of the axis plane is invariant. For our investigation, we are interesting in the case of (1:-2:1) – resonance at the origin. ...