proposition: Lemma lerz0 n : (n%:~R <= 0 :> R) = (n <= 0).
proof: Proof. by rewrite pmulrz_rle0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)