So, this vector field is not conservative.
所以，这个向量场不是保守场。
Well, we've seen this criterion that if a curl of the vector field is zero and it's defined in the entire plane, then the vector field is conservative, and it's a gradient field.
我们已经知道了一个准则，如果向量场的旋度为零，而且它在整个平面上有定义，那么这个向量场是保守的，而且它是个梯度场。
OK, so the first property that I will have for a vector field is that it's conservative.
第一个性质是有一个向量场,它是保守的。
So, it's an example of a vector field that is not conservative.
这是一个非保守场的例子。
One place where it comes up is when we try to understand whether a vector field is conservative.
当需要判断一个向量场是否保守向量场时,旋度也会派上用场的。
One place where it comes up is when we try to understand whether a vector field is conservative.
当需要判断一个向量场是否保守向量场时,旋度也会派上用场的。
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