proposition: Lemma adjoin_seqSl U V rs : (U <= V -> <<U & rs>> <= <<V & rs>>)%VS.
proof: Proof. by move=> sUV; rewrite agenvS ?addvS. 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)