There are actually other kinds of points where l the partia derivatives are zero. Let's give a name to this.

其实还有其他不是极值点,但偏导数为0的点，我们来给这样的点起个名。

youdao

There are actually other kinds of points where l the partia derivatives are zero. Let's give a name to this.

其实还有其他不是极值点,但偏导数为0的点，我们来给这样的点起个名。

youdao