二元函数极值的充分条件的一点补充

A Note on the Xufficient Condition of Binary Function's Extremum

本文给出了二元函数在B2-AC=0[1]的情况下取极值的充分条件,从而对二元函数在此情况下能否取极值可作出正确判断。

This paper gives sufficient condition of binary function's extremum when B^2-AC=0,under the condition of which we can made a correct decision on whether binary function gets Extreme value.