Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-11-24 10:55 5fce1791

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feat(logic/function/basic): refine extend_apply (#16944) Add function.extend_apply_of_unique which allows to rewrite function.extend f g e (f a) = g a not only when f is injective, what function.extend_apply does, but when f a = f b → g a = g b. Generalize a few similar lemmas in the same way. TODO ? : rewrite function.extend_apply to use this function.

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