∀ (K : SSet) (x : K.obj (Opposite.op (SimplexCategory.mk 0))) (Δ Δ' : SimplexCategoryᵒᵖ) (f : Δ ⟶ Δ'),
  (CategoryTheory.CategoryStruct.comp ((CategoryTheory.MonoidalCategoryStruct.tensorUnit SSet).map f) fun x_1 =>
      K.map ((Opposite.unop Δ').const (SimplexCategory.mk 0) 0).op x) =
    CategoryTheory.CategoryStruct.comp (fun x_1 => K.map ((Opposite.unop Δ).const (SimplexCategory.mk 0) 0).op x)
      (K.map f)