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.
所以，这个向量场不是保守场。
第一个性质是有一个向量场,它是保守的。
OK, so the first property that I will have for a vector field is that it's conservative.
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