Cyclicity of planar polycycles and ensembles with codimension 3 degeneration through a saddle-node and two hyperbolic saddles  

作　　者：赵丽琴 

出　　处：《Science China Mathematics》1998年第8期829-836,共8页中国科学：数学（英文版）

摘　　要：The cyclicity of four classes of codimension 3 plnnar polycycles and ensembles containing a saddle-node and two hyperbdic saddles is dealt with. The exnct cyclicity or cyclicity bound of them is obtained by finitely-smooth normal form theory.The cyclicity of four classes of codimension 3 planar polycycles and ensembles containing a saddle node and two hyperbolic saddles is dealt with. The exact cyclicity or cyclicity bound of them is obtained by finitely smooth normal form theory.

关 键 词：POLYCYCLE finitely smooth normal form transition MAP Dulac map. 

分 类 号：O189[理学—数学]