proposition: Lemma predeg_repr D : predeg (repr (\pi_{freeg K / int} D)) = predeg D.
proof: Proof. by rewrite !predegE prelift_repr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order generic_quotient) mathcomp(ssralg ssrnum ssrint)