fact: Definition mpwiden (p : {poly {mpoly R[n]}}) : {poly {mpoly R[n.+1]}} := map_poly mwiden p.
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