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The Necessary and Sufficient Conditions for a Kind of Quadratic Differential System to Exist two Weak Saddles

Song Guoqiang (Health Administration College Anhui Medical University Hefei 230032) Sheng Liren (Department of Mathematics Anhui University Hefei 230039)  
In this paper, the necessary and sufficient conditions for a kind of quadratic differential system to exist two weak saddles are given by using properties of primary singular point in the quadratic differential system and its equiinclined line diagram.Then we construct some numerical examples for some complex coefficient conditions.
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