proposition: Lemma lerN10 : -1 <= 0 :> R.
proof: Proof. by rewrite oppr_le0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)