proposition: Lemma ger0_def x : (0 <= x) = (`|x| == x).
proof: Proof. exact: ger0_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)