proposition: Lemma amullM u v : (amull (u * v) = amull v * amull u)%VF.
proof: Proof. by apply/lfunP => w; rewrite comp_lfunE !lfunE /= mulrA. 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)