什么是形式导数?（FormalDerivatives）,好像和环有关.

Question

什么是形式导数?（Formal Derivatives）,好像和环有关.

Answer 1

将原来仅限于标量的复形式导数,推广到复向量和复矩阵的范围,并系统地导出了复向量和复矩阵形式导数的运算法则；为电机工程的某些理论和计算方法的研究,提供了一个有力的数学工具.
The idea of complex formal derivatives is generalized from scalar to vector and ma-trix at first,then the manipulation rules of complex formal derivatives are derived systema-tically.As a mathematical tool,it is useful in the study of certain theory and numerical meth-od in electrical engineering problems.