proposition: Lemma memv_line u : u \in <[u]>%VS.
proof: Proof. by apply/vlineP; exists 1; rewrite scale1r. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)