∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Abelian C]
  [inst_2 : CategoryTheory.HasExt C] (X Y Z : C) (a b c : ℕ) (h : a + b = c),
  CategoryTheory.Abelian.Ext.bilinearComp X Y Z a b c h = CategoryTheory.Abelian.Ext.bilinearComp X Y Z a b c h