...非正合微分方程式，则可乘以一个函数F(x,y)，使得 FPdx+FQdy=0 变成正合微分方程式，其中F(x,y)称为积分因子(Integrating Factor)。
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Method of Integrating Factor 积分因子法
complex integrating factor 复合型积分因子的
integrating factor method 积分因子法
formal integrating factor 形式积分因子
multiplier integrating factor 乘积型积分因子
The Method of Integrating Factor 积分因子法
variate separated type integrating factor 变量分离型积分因子
Integrating E factor 积分因子
At the same time, the general form of generators of one-parameter Lie group which is accepted by two particular classes of second order automatic systems is given, thus the integrating factor of the system is constructed. (2) Base on Lie group theory, the method to obtain the integrating factors of the third order autonomous system by using of two one-parameter Lie groups accepted by the system is given and shown.
基于李群理论,给出并证明了利用三阶自治系统所接受的两个单参数李群的生成元求该系统的积分因子的方法与结论。
参考来源 - 基于李群理论的几类自治系统的可积性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
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