摘要
构造一条无切二次曲线用以研究一般的Ⅲ类方程ｘ＝－ｙ＋δｘ＋ｌｘ２＋ｍｘｙ＋ｎｙ２，ｙ＝ｘ（１＋ａｘ＋ｂｙ）（ｎ＞０）的极限环之唯一性，得到了两个新的判别法．它们分别是对奇点Ｏ０，１ｎ和Ｏ（０，０）外围的极限环给出的．
The two new criteria for the uniqueness of the limit cycles of the general systems of Type Ⅲ have been given by using the Quadratic curve without contact.
出处
《工科数学》
1997年第4期54-57,共4页
Journal of Mathematics For Technology
关键词
方程
二次曲线
一般
构造
类方
研究
systems of type Ⅲ, limit cycle, uniqueness, quadratic curve without contact.
