fact: Definition idtoiso_whisker_l C D E (F : Functor D E) (G G' : Functor C D) (T : G = G') : whisker_l F (Category.Morphisms.idtoiso (_ -> _) T : morphism _ _ _) = (Category.Morphisms.idtoiso (_ -> _) (ap _ T) : morphism _ _ _).
imports: Category.Core Functor.Core NaturalTransformation.Core NaturalTransformation.Composition.Core Functor.Composition.Core Category.Morphisms FunctorCategory.Core NaturalTransformation.Paths Basics.Tactics