I should say that is for a function of two variables to try to decide whether a given critical point is a minimum, a maximum or a saddle point.

但这种办法并不普遍，只能用于二元函数，来判断是极小值点、极大值点还是鞍点。

youdao

I should say that is for a function of two variables to try to decide whether a given critical point is a minimum, a maximum or a saddle point.

但这种办法并不普遍，只能用于二元函数，来判断是极小值点、极大值点还是鞍点。

youdao