Γ用矩阵正定、负定、不定性求多函数极值

Shoulder definitely or indefinite,ask the extreme value of plural function definitely by matrix

把多元函数化作一个二次型,求出二次型的矩阵,由矩阵的正定、负定、不定性求出多元函数在某点的极值,给出了一般多元函数极值方法.

The article transforms plural function into first 2 types, asks out two second-class matrix, by shouldering it definitely,indefinitely in the extreme value at certain points of matrix and provides the method to ask extreme value of general plural function.