proposition: Fact M22_proj12 a1 b1 c1 d1 a2 b2 c2 d2 : (a1,b1,c1,d1) = (a2,b2,c2,d2) :> M22 -> c1 = c2.
proof: Proof. inversion 1; auto. Qed.
imports: Arith ZArith Undecidability.Shared.Libs.DLW.Utils(utils_tac gcd prime binomial sums)