fact: Definition sum_of_functor_inr {Q C₁ C₂ : category} (F : C₁ ⟶ Q) (G : C₂ ⟶ Q) : inr_functor C₁ C₂ ∙ sum_of_functors F G ⟹ G.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.whiskering