proposition: Lemma absz_eq0 m : (`|m| == 0) = (m == 0%R).
proof: Proof. by case: (intP m). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)