本文给出了利用梯度判定多元函数极值的判别法，并提供了若干范例。
In this paper we give a method of test, which makes use of the gradient, to verify the extreme value of multivariate function, and give some typical examples.
研究了求解无约束极值问题的DFP变尺度法和FR共轭梯度法的关系问题。
In this paper, the relationship of DFP variable metric method and FR conjugate gradient method is investigated.
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