[Merged by Bors] - refactor(*): Add _injective alongside _inj lemmas
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…njective` lemmas
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This adds four new `injective` lemmas: * `list.append_right_injective` * `list.append_left_injective` * `sub_right_injective` * `sub_left_injective` It also replaces as many `*_inj` lemmas as possible with an implementation of `*_injective.eq_iff`, to make it clear that the lemmas are just aliases of each other.
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This adds four new `injective` lemmas: * `list.append_right_injective` * `list.append_left_injective` * `sub_right_injective` * `sub_left_injective` It also replaces as many `*_inj` lemmas as possible with an implementation of `*_injective.eq_iff`, to make it clear that the lemmas are just aliases of each other.
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_injective alongside _inj lemmas_injective alongside _inj lemmas
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This adds four new
injectivelemmas:list.append_right_injectivelist.append_left_injectivesub_right_injectivesub_left_injectiveIt also replaces as many
*_injlemmas as possible with an implementation of*_injective.eq_iff, to make it clear that the lemmas are just aliases of each other.