center-focus determination
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From Chapter 3 to Chapter 6, the center-focus determination and bifurcation of the equator are studied for real planar odd polynomial differential systems.
在第三章至第六章，我们研究实平面奇数次多项式微分系统无穷远点(赤道)的中心焦点判定与赤道极限环分支。
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