Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-12-19 16:17 c55721d6

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chore(analysis/calculus/{fderiv,deriv}): f x ≠ f a for x ≈ a, x ≠ a if ∥z∥ ≤ C * ∥f' z∥ (#5420)

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