∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  {D : Type u_2} [inst_2 : CategoryTheory.Category.{v_2, u_2} D] (F : CategoryTheory.Functor C D) (X : C),
  (CategoryTheory.Functor.LaxMonoidal.ofBifunctor.bottomMapᵣ F).app X =
    F.map (CategoryTheory.MonoidalCategoryStruct.rightUnitor X).hom