proposition: Lemma form0l u : '[0, u] = 0.
proof: Proof. by rewrite /form !mul0mx mxE. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg fingroup zmodp poly ssrnum) mathcomp(matrix mxalgebra vector falgebra ssrnum algC algnum) mathcomp(fieldext) mathcomp(vector)