What is the gradient of this function?
这个函数的梯度是什么？
Well, so, what's the gradient of this function?
那么，这一函数的梯度是什么？
Say that f, our vector field is actually the gradient of some function.
也就是向量场f实际上是一个函数的梯度。
The question is how do we find the function which has this as gradient?
问题是怎么找出梯度是这个的函数？
Well, you take the gradient of a function.
作出一个函数的梯度。
You know it's a gradient, f and you know the function, little f.
如果知道一个梯度，相应地就有一个函数。
You know it's a gradient, f and you know the function, little f.
如果知道一个梯度，相应地就有一个函数。
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