proposition: Lemma Pullback_of_z_iso' {C:category} {a b c : C} {f : C ⟦b, a⟧} {g : C ⟦c, a⟧} (fis : is_z_isomorphism f) (pb : Pullback f g) : is_z_isomorphism (PullbackPr2 pb).
proof: Proof. use (Pullback_of_z_iso _ (switchPullback pb)). exact fis. Defined.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.TransportMorphisms UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Limits.Terminal UniMath.CategoryTheory.Limits.BinProducts UniMath.CategoryTheory.Limits.Equalizers UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.Monics