proposition: Fact gez0_norm m : lez 0 m -> normz m = m.
proof: Proof. by case: m. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)