proposition: Lemma commr_mpolyX m p : GRing.comm p 'X_[m].
proof: Proof. apply/mpolyP=> k; rewrite mcoeffM mcoeffMr. by apply/eq_bigr=> /= i _; rewrite !mcoeffX GRing.commr_nat. 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