fact: Definition commutes_pT_F C D (F G : Functor C D) (T : NaturalTransformation F G) s d d' (m : morphism C s d) (m' : morphism D _ d') : (m' o T d) o F _1 m = (m' o G _1 m) o T s := ((Category.Core.associativity _ _ _ _ _ _ _ _) @ ap _ (commutes _ _ _ _) @ (Category.Core.associativity_sym _ _ _ _ _ _ _ _))%path.
imports: Category.Core Functor.Core