∀ {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] (f : WithConv (C →ₗ[R] A)), f * 1 = f