theorem
  for V, W being non empty ModuleStr over INT.Ring, g being Functional of W
    holds
  FormFunctional(0Functional(V),g) = NulForm(V,W)
  proof
    let V, W be non empty ModuleStr over INT.Ring, h be Functional of W;
    now
      let v be Vector of V, y be Vector of W;
      thus FormFunctional(0Functional(V),h).(v,y) = 0 by BLTh21
      .= NulForm(V,W).(v,y) by FUNCOP_1:70;
    end;
    hence thesis;
  end;
