∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {G G_1 : C} (e_G : G = G_1) [inst_1 : CategoryTheory.Abelian C]
  (hG : CategoryTheory.IsSeparator G) {X : C} (A A_1 : CategoryTheory.Subobject X),
  A = A_1 →
    CategoryTheory.IsGrothendieckAbelian.generatingMonomorphisms.largerSubobject hG A =
      CategoryTheory.IsGrothendieckAbelian.generatingMonomorphisms.largerSubobject ⋯ A_1