fact: Definition pure {A} : A ~> F A := fmap unit_right ∘ strength ∘ id[A] ⨂ lax_pure ∘ unit_right⁻¹.
imports: Category.Lib Category.Theory.Category Category.Theory.Isomorphism Category.Theory.Functor Category.Theory.Naturality Category.Structure.Monoidal Category.Functor.Bifunctor Category.Functor.Strong Category.Functor.Structure.Monoidal