proposition: Lemma mem_msuppXP m m' : reflect (m = m') (m' \in msupp 'X_[m]).
proof: Proof. by rewrite msuppX mem_seq1; apply: (iffP eqP). 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