A very basic question:(adsbygoogle = window.adsbygoogle || []).push({});

Is the directional derivative of a scalar function F at some point 'a' in the direction V the same as the directional derivative of F at 'a' in the direction 2V?

Going by http://en.wikipedia.org/wiki/Directional_derivative#Definition" definition of a directional derivative (using a non-normalized direction vector), they appear to be different!

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# Directional derivative of F in the direction V is the same as in the direction 2V?

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