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Preferred term

second derivative  

Definition

  • In calculus, the second derivative, or the second-order derivative, of a function f is the derivative of the derivative of f. Informally, the second derivative can be phrased as "the rate of change of the rate of change"; for example, the second derivative of the position of an object with respect to time is the instantaneous acceleration of the object, or the rate at which the velocity of the object is changing with respect to time.
    (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Second_derivative)

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http://data.loterre.fr/ark:/67375/PSR-VK93MJQ6-D

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