theorem
  for V, W being non empty ModuleStr over INT.Ring, f being Form of V,W holds
  (1.INT.Ring)*f = f
  proof
    let V, W be non empty ModuleStr over INT.Ring, f be Form of V,W;
    now
      let v be Vector of V, w be Vector of W;
      thus ((1.INT.Ring)*f).(v,w) = (1.INT.Ring) * f.(v,w) by BLDef3
      .= f.(v,w);
    end;
    hence thesis;
  end;
