proposition: Fact Zp_opp_plus_eq x y z : x ⊕ y = z <-> x = z ⊕ ∸ y.
proof: Proof. split; intros; subst; ring. 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)