∀ {R : Type u} [inst : CommRing R] {X Y : Type v} [inst_1 : CommRing X] [inst_2 : Algebra R X] [inst_3 : CommRing Y]
  [inst_4 : Algebra R Y] (f : X →ₐ[R] Y) (x : X), (CategoryTheory.ConcreteCategory.hom (CommAlgCat.ofHom f)) x = f x