proposition: Lemma R_of_Q_sub (F : numFieldType) x y : R_of_Q (x - y) = R_of_Q x - R_of_Q y :> F.
proof: Proof. by rewrite R_of_Q_add R_of_Q_opp. Qed.
imports: elpi(elpi) Coq(QArith) Coq.micromega(OrderedRing RingMicromega) mathcomp(all_ssreflect ssralg ssrnum ssrint) mathcomp.zify(ssrZ zify)