proposition: Lemma abszN m : `|- m| = `|m|.
proof: Proof. by case: (normrN m). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)