As for Poincaré’s centre-problem Poincaré [3] himself assumed that if the origin is a centre then there is an integral (constant of motion) being analytic in a neighborhood of the origin. We are going to prove this assumption and vice versa in a concise way by using techniques developed by C. L. Siegel [6].
Print ISSN: 0174-4747
Volume: 25, 04/2005
Pages: 275 - 279