Suppose F(x,y,z) = 0(adsbygoogle = window.adsbygoogle || []).push({});

grad (F) = 0 ???

e.g. F = x + y + z

grad (F) = <1,1,1> =/= <0,0,0> ??

I don't know why I get an opposite result

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# Gradient of a zero function

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