proposition: Lemma mpolyOver_addr_closed : addr_closed (mpolyOver S).
proof: Proof. split=> [|p q Sp Sq]; first exact: mpolyOver0. by apply/mpolyOverP=> i; rewrite mcoeffD rpredD ?(mpolyOverP _). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype tuple finfun bigop finset binomial) mathcomp(order fingroup perm ssralg zmodp poly ssrint) mathcomp(matrix vector) mathcomp(bigenough) ssrcomplements freeg