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[Merged by Bors] - feat(counterexamples/pseudoelement): add counterexample to uniqueness in category_theory.abelian.pseudoelement.pseudo_pullback - #13387
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Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: Johan Commelin <johan@commelin.net>
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… in category_theory.abelian.pseudoelement.pseudo_pullback (#13387) Borceux claims that the pseudoelement constructed in `category_theory.abelian.pseudoelement.pseudo_pullback` is unique. We show here that this claim is false.
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Borceux claims that the pseudoelement constructed in
category_theory.abelian.pseudoelement.pseudo_pullbackis unique. We show here that this claim is false.