函数极值必要与充分条件的椎广

The popularization of the essential and sufficient conditions for the extreme value of function

应用矩阵的语言，对一、二元函数的极值必要条件与充分条件作了推广，从而给出了n元函数的极值必要条件与充分条件，为多元函数极值的讨论提供了一种判别方法。

This paper deals with the popularization of the essential and sufficient conditions for the extreme value of function on the basis of a single and two independent variables by using matrix language.In doing so, it offers not only the essentral and sufficient conditions for the extreme value of many independent variables, but also a method of discrimination for the discussion on the extreme value of function of many independent variables.