∀ {J : Type u_3} {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C]
  [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C] {f g : J → C} [inst_2 : CategoryTheory.Limits.HasBiproduct f]
  [inst_3 : CategoryTheory.Limits.HasBiproduct g] (p : (b : J) → f b ≅ g b),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.biproduct.map fun b => (p b).inv)
      (CategoryTheory.Limits.biproduct.map fun b => (p b).hom) =
    CategoryTheory.CategoryStruct.id (⨁ g)