∀ {R : Type u_1} {S : Type u_2} {C : Type u_3} [inst : CommSemiring R] [inst_1 : CommSemiring S] [inst_2 : Algebra R S]
  [inst_3 : Semiring C] [inst_4 : Algebra S C] [inst_5 : Algebra R C] [IsScalarTower R S C], SMulCommClass R S C