proposition: Lemma lt0r x : (0 < x) = (x != 0) && (0 <= x).
proof: Proof. exact: lt_def. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)