Homotopy Type Theory differentiable function > history (Rev #7, changes)

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Given an Archimedean ordered field FF , a functionpointwise continuous functionf:FFf:F \to F isf:FFf:F \to F is pointwise differentiable if it comes with a function D(f):FFD(f):F \to F called the derivative and such that for every positive element ϵ:F +\epsilon:F_+, there exists a positive element δ:F +\delta:F_+ such that for every element h:Fh:F such that 0<max|(h , |h)<δ 0 \lt \max(h, \vert -h) h \vert \lt \delta and for every element x:Fx:F,

|f(x+h)f(x)hD(f)(x)|<ϵ\vert f(x + h) - f(x) - h D(f)(x) \vert \lt \epsilon

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