fact: Definition nattrans_naturality {B C:category} {F F':[B, C]} {b b':B} (p : F --> F') (f : b --> b') : p ◽ b' ∘ F ▭ f = F' ▭ f ∘ p ◽ b := nat_trans_ax p _ _ f.
imports: UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.opp_precat UniMath.CategoryTheory.yoneda UniMath.CategoryTheory.Categories.HSET.Core UniMath.CategoryTheory.Categories.HSET.MonoEpiIso UniMath.Foundations.Preamble UniMath.Foundations.Sets UniMath.MoreFoundations.Tactics