proposition: Lemma msuppP (g : {malg G[K]}) (k : K) : msupp_spec g k (k \in msupp g) g@_k.
proof: Proof. by rewrite /mcoeff; case: finsuppP => h; constructor. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap