proposition: Lemma memvZ U k : {in U, forall v, k *: v \in U}.
proof: Proof. exact: rpredZ. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)