proposition: Fact Z2Zp_one : 〘1〙 = Op.
proof: Proof. rewrite Z2Zp_pos; try lia. apply Zp_inj; simpl; f_equal; auto. Qed.
imports: Arith Lia ZArith List Permutation Eqdep_dec Undecidability.Shared.Libs.DLW.Utils(utils_tac utils_list gcd prime binomial sums php) Undecidability.H10.ArithLibs(matrix)