∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {D : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} D]
  (F : CategoryTheory.Functor C D) [inst_2 : F.Initial] {E : Type u₃} [inst_3 : CategoryTheory.Category.{v₃, u₃} E]
  (G : CategoryTheory.Functor D E),
  (CategoryTheory.Functor.Initial.conesEquiv F G).functor = CategoryTheory.Functor.Initial.extendCone