proposition: Lemma memv_algid U : algid U \in U.
proof: Proof. by rewrite /algid; case: algid_subproof. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype div tuple finfun bigop ssralg) mathcomp(finalg zmodp matrix vector poly)