proposition: Lemma subvs_scaleAl k (x y : subvs_of A) : k *: (x * y) = (k *: x) * y.
proof: Proof. exact/val_inj/scalerAl. 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)