∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {A B : C}
  [inst_1 : CategoryTheory.Limits.HasBinaryProduct A B] {Z : C} (h : A ⟶ Z),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.opProdIsoCoprod A B).inv.unop
      (CategoryTheory.CategoryStruct.comp CategoryTheory.Limits.coprod.inl.unop h) =
    CategoryTheory.CategoryStruct.comp CategoryTheory.Limits.prod.fst h