: Mathématiques: differentiable function

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differentiable function

In mathematics, a differentiable function of one real variable is a function whose derivative exists at each point in its domain. In other words, the graph of a differentiable function has a non-vertical tangent line at each interior point in its domain. A differentiable function is smooth (the function is locally well approximated as a linear function at each interior point) and does not contain any break, angle, or cusp.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Differentiable_function)

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