proposition: Lemma ge0_def x : (0 <= x) = (`|x| == x).
proof: Proof. by rewrite le_def subr0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)