proposition: Lemma formDr u v w : '[u, v + w] = '[u, v] + '[u, w].
proof: Proof. by rewrite /form linearD !map_mxD !mulmxDr 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)