proposition: Lemma natz (n : nat) : n%:R = n%:Z :> int.
proof: Proof. by rewrite pmulrn intz. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)