任永泰.在有限部分具有四个奇点二次系统的无穷远奇点[J].数学研究及应用,1984,4(4):37~42
在有限部分具有四个奇点二次系统的无穷远奇点
Infinite Singular Point of Quadratic System with Four Singular Points at Finity
投稿时间:1981-09-03  
DOI:10.3770/j.issn:1000-341X.1984.04.011
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任永泰 东北师范大学 
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      Suppose that E24 is quadratic system which possesses four singular points at finity. We study singular points of El at infinity. The results are as follows.1. If E24 possesses three singular points at infinity, then they are all elementary singular points.2. If E24 possesses two singular points at infinity, then one of them is elementary singular point, another is higher singular points.3. If E24 possess higher singular point at infinity, then it's saddle-nodel of second form;4. If E24 possess one singular point at infinity, then it's elementary singular point.
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