proposition: Theorem plusP_uniq_eqP : forall p q r s, plusP p q r -> plusP p q s -> eqP A eqA n r s.
proof: Proof. Proof using os multA minusA invA divA cs A1. intros p q r s H' H'0; rewrite (uniq_plusp (p, q) r s); auto. Qed.
imports: Coq(Arith) Buchberger(LetP)