∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {F : CategoryTheory.Functor Cᵒᵖ (Type w)} {X Y : C}
  (e : Y ≅ X) (R : F.RepresentableBy Y),
  (CategoryTheory.Functor.RepresentableBy.equivOfIsoObj e).symm R = R.ofIsoObj e.symm