One of them is to find the minimum ofamaximumofafunction 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。
2
OK, so last time we saw how to use Lagrange multipliers to find the minimum or maximumofafunction 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。
3
Limiting the maximum number of live variables: this is typically achieved by keeping expressions simple and small, and not using too many variables in afunction.