proposition: Lemma subringClosedP (rngS : subringClosed R) : subring_closed rngS.
proof: Proof. split; [ exact: rpred1 | exact: (zmodClosedP rngS).2 | exact: rpredM ]. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(choice fintype finfun bigop prime binomial)