proposition: Fact M22scal_mult k1 k2 : forall x, M22scal k1 (M22scal k2 x) = M22scal (k1⊗k2) x.
proof: Proof. Proof using R_is_ring. myauto 1. Qed.
imports: Arith ZArith Undecidability.Shared.Libs.DLW.Utils(utils_tac gcd prime binomial sums)