fact: Definition counit_l : NaturalTransformation (pointwise (identity E) F o pointwise (identity E) G) (identity (E -> D)).
imports: Category.Core Functor.Core NaturalTransformation.Core Functor.Identity Functor.Composition.Core NaturalTransformation.Composition.Core Adjoint.Core Adjoint.UnitCounit Adjoint.UnitCounitCoercions Functor.Pointwise.Core Category.Morphisms FunctorCategory.Morphisms FunctorCategory.Core NaturalTransformation.Paths Functor.Paths Basics.PathGroupoids HoTT.Tactics Types.Arrow