∀ (m : Type u_4) (R : Type u_1) (S : Type u_2) (A : Type u_3) [inst : CommSemiring R] [inst_1 : Semiring A]
  [inst_2 : Algebra R A] [inst_3 : CommSemiring S] [inst_4 : Algebra R S] [inst_5 : Algebra S A] [IsScalarTower R S A],
  SMulCommClass R S (Matrix m m A)