fact: Definition pair_nat_trans {C₁ C₂ C₁' C₂' : category} {F₁ F₂ : C₁ ⟶ C₁'} {G₁ G₂ : C₂ ⟶ C₂'} (τ : F₁ ⟹ F₂) (θ : G₁ ⟹ G₂) : pair_functor F₁ G₁ ⟹ pair_functor F₂ G₂.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.opp_precat