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[Merged by Bors] - feat(logic/nontrivial): function.injective.exists_ne #3983
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Add a lemma that an injective function from a nontrivial type has an argument at which it does not take a given value.
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Add a lemma that an injective function from a nontrivial type has an argument at which it does not take a given value.
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Add a lemma that an injective function from a nontrivial type has an argument at which it does not take a given value.
PatrickMassot
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Add a lemma that an injective function from a nontrivial type has an argument at which it does not take a given value.
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Add a lemma that an injective function from a nontrivial type has an
argument at which it does not take a given value.