fact: Definition mpoly_mul p q : {mpoly R[n]} := [mpoly \sum_(m <- msupp p @@ msupp q) p *M_[m] q].
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