proposition: Lemma rpred_int (R : ringType) (S : subringClosed R) m : m%:~R \in S.
proof: Proof. by rewrite rpredMz ?rpred1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)