So, if you prefer, that's where the gradient vector is zero.
认为梯度向量为零也是可以的。
The problem is not every vector field is a gradient.
问题是，不是所有向量场都是梯度。
The normal vector will just be the gradient.
法向量就是梯度向量。
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。
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。
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