ON TWO CONJECTURES OF THE QUADRATIC DIFFERENTIAL SYSTEMS  

作　　者：ZHANG XIANG Institute of Mathematics,Nanjing Normal University,Nanjing 210097,China 

出　　处：《Chinese Annals of Mathematics,Series B》1997年第4期429-434,共6页数学年刊（B辑英文版）

摘　　要：Two conjectures in the qualitative theory of quadratic differential systems are proved under certain conditions.

关 键 词：Quadratic system Limit cycle Dulac function 

分 类 号：O175[理学—数学]