fact: Definition injectX n (m : 'X_{1..n}) : {ipoly R[n]} := \prod_(i < n) (@inject1 _ (rshift 1 i) 'X)^+(m 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