∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Preadditive C]
  [inst_2 : CategoryTheory.Limits.HasFiniteBiproducts C] (F : CategoryTheory.Functor C AddCommGrpCat)
  [inst_3 : CategoryTheory.Limits.PreservesFiniteLimits F] (X : C),
  CategoryTheory.CategoryStruct.comp CategoryTheory.MonObj.one Multiplicative.toAdd.toIso.hom =
    CategoryTheory.MonObj.one