| import Mathlib | |
| open CategoryTheory Limits | |
| variable {C : Type u} [SmallCategory C] | |
| variable {D : Type u} [SmallCategory D] | |
| variable (F G : C ⥤ D) | |
| def homIntegrandBifunctor : Cᵒᵖ × C ⥤ Type u := | |
| (Functor.prod F.op G) ⋙ (Functor.hom D) | |
| theorem natTransIsoEnd : | |
| Nonempty (NatTrans F G ≅ end_ (curryObj (homIntegrandBifunctor F G))) := by | |
| sorry | |