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 Volume 3, Number 3, 2013, Pages 279-290                                                                DOI：10.11948/2013020 The cyclicity of the period annulus of two classes of cubic isochronous systems Yi Shao,Kuilin Wu Keywords:Isochronous center Abstract: In this paper, we investigate the cyclicity of the period annulus of two classes of cubic isochronous systems.By using the Chebyshev criterion, we prove that the two systems have respectively at most three and four limit cycles produced fromthe period annulus around the isochronous center under cubic perturbations. PDF      Download reader