One of them is to find the minimum of a maximum of a function when the variables are not independent, and that is the method of Lagrange multipliers.

其中一个是找出一个函数的极小值，极大值，这个函数的变量是相关的，这种方法称为拉格朗日乘数法。

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OK, so last time we saw how to use Lagrange multipliers to find the minimum or maximum of a function of several variables when the variables are not independent.

上次我们看了，怎样利用拉格朗日算子，去求解一个受约束的，多变量函数的最大最小值。

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Limiting the maximum number of live variables: this is typically achieved by keeping expressions simple and small, and not using too many variables in a function.

限制活变量的最大数目：通常可以使用简单小巧的表达式，在函数内部不使用太多的变量。

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