Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-02-12 14:15 254c3ee1

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feat(analysis/special_functions/exp_log): added log_div (#6196) ∀ x y : ℝ, x ≠ 0 → y ≠ 0 → log (x / y) = log x - log y

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