∀ {R : Type u_3} {A : Type u_1} {C : Type u_2} [inst : CommSemiring R] [inst_1 : Semiring A] [inst_2 : Algebra R A]
  [inst_3 : AddCommMonoid C] [inst_4 : Module R C] [inst_5 : Coalgebra R C] (n : ℕ), (n + 1).unaryCast = n.unaryCast + 1