Isochronicity conditions for some planar polynomial systems II

Magali Bardet, Islam Boussaada, A. Raouf Chouikha +1

We study the isochronicity of centers at $O\in {\mathbb{R}}^2$ for systems $$\dot{x}=-y+A(x,y),\dot{y}=x+B(x,y),$$ where $A,B\in \mathbb{R}[x,y]$, which can be reduced to the Liéna…