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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. Co-authored-by: Antoine Chambert-Loir <antoine.chambert-loir@math.univ-paris-diderot.fr> Co-authored-by: Floris van Doorn <fpvdoorn@gmail.com>
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