fact: Definition mmulti (p : {poly {mpoly R[n]}}) : {mpoly R[n.+1]} := \sum_(i < size p) ((mwiden p`_i) * ('X_ord_max) ^+ i).
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