Why is the function decreasing the fastest in the direction of the negative of the gradient?(adsbygoogle = window.adsbygoogle || []).push({});

Just because it increases the fastest in the direction of the positive of the gradient why does this have to mean it has to decrease the fstest in the negative of the gradient?

If you stand facing a steep mountain and ityou have flats behind you and a huge drop on your sides, it would decrease faster to 90 degress than behind you. What am I not understanding with gradients?

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# Why is a function decreasing the fastest in dir of neg of the gradient?

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