二元函数极值充分条件的证明及条件极值的判定

A Proof of the Adequate Conditions for D ualistic Function Extremum and Jadgment on Conditional Extremum

本文利用方向导数证明了二元函数极值的充分条件.给出了判定二元函数条件极值为极大值或极小值的一个可行方法.

Abstract This article proves by directional deriratire the adequate conditions for dualistic function extremum. It provides afeasible method to judge dualistic function conditional ex-tremum to be big or small.