It's a good sign that this is logarithmic, and I'm going to come back in a second to why logs are a great thing.

为什么对数级复杂度是个好事情，让我们再来看一个算法,噢，抱歉是让我们再来看两个算法。

麻省理工公开课 - 计算机科学及编程导论课程节选

And the reason that we now on the second line have the equal sign is because this function GetString has what's called a return value.

我们之所以,在第二行代码GetString前面加上等号,是因为这个函数会带回一个,返回值。

哈佛公开课 - 计算机科学课程节选

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

耶鲁公开课 - 博弈论课程节选