proposition: Lemma precoeff_repr x rD : precoeff x (repr (\pi_{freeg K / R} rD)) = precoeff x rD.
proof: Proof. by rewrite !precoeffE prelift_repr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order generic_quotient) mathcomp(ssralg ssrnum ssrint)