proposition: Fact M22scal_MU22_l k : forall x y, M22scal k (x ⊠ y) = M22scal k x ⊠ y.
proof: Proof. Proof using R_is_ring. myauto 2. Qed.
imports: Arith ZArith Undecidability.Shared.Libs.DLW.Utils(utils_tac gcd prime binomial sums)