proposition: Lemma ltrn0 n : (n%:R < 0 :> R) = false.
proof: Proof. by rewrite -[0]/0%:R ltr_nat ltn0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)