fact: Definition isPullback_in_product_category_mor : q --> w := PullbackArrow P₁ _ (pr1 h₁) (pr1 h₂) (maponpaths pr1 r) ,, PullbackArrow P₂ _ (pr2 h₁) (pr2 h₂) (maponpaths dirprod_pr2 r).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.PrecategoryBinProduct UniMath.CategoryTheory.Limits.Terminal UniMath.CategoryTheory.Limits.BinProducts UniMath.CategoryTheory.Limits.Pullbacks UniMath.CategoryTheory.Limits.Initial UniMath.CategoryTheory.Limits.BinCoproducts UniMath.CategoryTheory.Limits.Preservation