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Volume 10, Number 6, 2020, Pages 2506-2520                                                                DOI:10.11948/20190391
Research on the composition center of a class of rigid differential systems
Yuexin Yan,Zhengxin Zhou
Keywords:Uniformly isochronous center, rigid system, composition conjecture, composition center, center conditions.
      In this paper, we answer the question: under what conditions a class of rigid differential systems have a composition center. We give the sufficient and necessary conditions for these systems to have a center at origin point. At the same time, we give the formula of focal values and the highest order of fine focus.
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