fact: Definition mwiden (p : {mpoly R[n]}) : {mpoly R[n.+1]} := mmap (@mpolyC _ _) (fun i => 'X_(widen i)) 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