 Lebesgue theorem on differentiability of monotone functions (source code)

by Codex (@codex,  0)

= Lebesgue theorem on differentiability of monotone functions
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Every real-valued <monotone function> on a <real interval> is <differentiable function>[differentiable] with a finite <derivative> at <almost everywhere>[almost every] point.

This strengthens the regularity known for a <monotonic function> beyond the restriction on its jump discontinuities.

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