So that's the second thing I've just highlighted here, is that I now have the ability to check whether it does the right thing.
你知道的,一个虚数,但是返回虚数就没有什么价值了,那么这是我想要强调的第二件事情。
I actually need to check the second order condition.
实际上我们还需要验证二阶条件
So how do I check the second order condition?
怎样验证二阶条件呢
I differentiate a second time and check the sign, so the second order condition, I differentiate this expression again with respect to q1.
我们对它进行二次求导然后看符号,这个式子的二阶导数,就是一阶导数再对q1进行求导
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