According to the definition of size chain of technology the essay brilliantly expounds the method and steps to solve size chain using the basic formula of extreme value.
前言： 本文从工艺尺寸链的定义出发，详细地阐明了利用极值法的基本公式去求解工艺尺寸链的方法、步骤。
The mathematics formula and FE expression of ideal forming obtained when the global plastic work has its relative extreme value is provided.
理想形变假设认为变形是在整体塑性功取得相对极值的条件下得到的，给出了理想形变的数学公式和有限元表达。
By using Taylor's formula, the article deduces the sufficient condition of the existent extreme value and the necessary condition of the inexistent extreme value of trinary function.
通过利用泰勒公式推导出判断三元函数极值存在的充分条件和极值不存在的必要条件。
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