| THE POINCAR BIFURCATION OF QUADRATIC SYSTEMS HAVING A REGION CONSISTING OF PERIODIC CYCLES BOUNDED BY A HYPERBOLA AND AN ARC OF EQUATOR |
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| 作者姓名： | Song Yan (Dept. of Math. Bohai University Jinzhou 121000) |
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| 作者单位： | Dept. of Math.，Bohai University，Jinzhou 121000 |
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| 摘 要： | The usual bifureation problems oeeurred in the study of the Planar differential systems having a region eonsisting of Periodie eycles are as follows:15 there any closed orbit whieh generates limit eyeles after a small perturbation?How many limit eyel
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