Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-06-03 16:16 d63246c0

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feat(analysis/calculus/fderiv_measurable): the right derivative is measurable (#14527) We already know that the full Fréchet derivative is measurable. In this PR, we follow the same proof to show that the right derivative of a function defined on the real line is also measurable (the target space may be any complete vector space).

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