second derivative

基本解释

We cannot use the second derivative test.
这里不能用二次导数来验证。
So, what does the second derivative test say?
那么二阶导数判定是怎样的呢？
Basically, the answer for us is that we don't have a second derivative test in this situation.
基本上，答案就是,我们不可以用二次导数来验证这个情况。

And all this is, is saying that when you take a mixed second derivative, it doesn't matter in which order you take the two derivatives.
麦克斯韦关系的本质是,当你考虑混合的二阶导数时，求导的顺序不影响最后的结果,现在，我们利用这些关系。
麻省理工公开课 - 热力学与动力学课程节选
What's a function, what's a derivative, what's a second derivative, how to take derivatives of elementary functions, how to do elementary integrals.
什么是函数,什么是导数,什么是二阶导数,如何对初等函数求导,如何进行初等积分
耶鲁公开课 - 基础物理课程节选
But, of course, we want to go all the way to distance, so we take the second derivative and we have this equation for force here.
当然我们最后想要的是距离,所以我们取二阶微,分就有这个式子。
麻省理工公开课 - 化学原理课程节选

There is much to be said for connoisseurship and its second derivative huge future returns.
FORBES: Overpriced Art Versus Cheap Stocks

二阶导数
Traditionally, the method of bar code recognition is based on zero crossing of the second derivative.
传统的条码识别方法是通过二阶导数零交叉来定位条码边界。
医药科学
二阶导数