Center Conditions for a Class of Rigid Quintic Systems
Fei Fei Lu · Asian Research Journal of Mathematics · 2019
The problem of determining necessary and sufficient conditions on P and Q for system. x = - y+P(x+y),y = x+Q(x+y) to have a center at the origin is known as the Poincaré center-focus problem. So far, people has tried many ways to solve the problem of central focus. However, it is...
Open access
Research Article
10.9734/arjom/2019/v15i130138