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directional derivative  

Définition

  • In mathematics, the directional derivative of a multivariable differentiable (scalar) function along a given vector v at a given point x intuitively represents the instantaneous rate of change of the function, moving through x with a velocity specified by v. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Directional_derivative)

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http://data.loterre.fr/ark:/67375/MDL-CN1VJLNF-N

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