proposition: Lemma formZr a u v : '[u, a *: v] = theta a * '[u, v].
proof: Proof. by rewrite /form !(linearZ, map_mxZ) /= 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)