NECESSARY AND SUFFICIENT CONDITIONS OF A PLANE n-DEGREE SYSTEM WITH DULAC’S CENTER  

作　　者：李学敏[1] 陈玉波[1] 

机构地区：[1]山东师范大学,250014

出　　处：《Annals of Differential Equations》1997年第4期366-376,共11页微分方程年刊（英文版）

摘　　要：In this paper, we discuss the necessary and sufficient conditions of a plane n-degree system with Dulac’s center.In this paper, we discuss the necessary and sufficient conditions of a plane n-degree system with Dulac’s center.

关 键 词：plane n-degree system Dulac center singular curve 

分 类 号：O212[理学—概率论与数理统计]