proposition: Lemma mderivnX i k m : 'X_[m]^`M(i, k) = ((m i)^_k)%:R *: 'X_[m - U_(i) *+ k].
proof: Proof. by rewrite mderivnE msuppX big_seq1 mcoeffX eqxx mulr1. Qed.
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