巴乌金二次系统焦点量又一种计算方法

A New Approach for Calculating Focus of Bаутин's Quadratic Differential System

通过具有三阶细鞍点二次系统的鞍点量公式,较简洁地推证出具有三阶细焦点巴乌金(Bаутин)二次系统的焦点量公式,由此说明二次系统的焦点量与鞍点量的相互关系。

Based on the saddle point value of a quadratic differential system with weak 3-order saddle points, the paper gives concise yet clear derivation of the focus value of BayrTNH＇s quadratic different system with weak 3-order focuses. As a result, the profound relation between saddle point value and focus value of quadratic differential system is validated.