proposition: Lemma rpred_int_num (S : subringClosed R) x : x \is a int_num -> x \in S.
proof: Proof. by move=> /intrP[n ->]; rewrite rpred_int. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg poly ssrnum ssrint)