proposition: Lemma dimv1: \dim (1%VS : {vspace aT}) = 1.
proof: Proof. by rewrite dim_vline oner_neq0. 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)