proposition: Lemma ltr0Sn n : 0 < n.+1%:R :> R.
proof: Proof. by elim: n => // n; apply: addr_gt0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)