
theorem HTh29:
  for V, W being right_zeroed non empty ModuleStr over INT.Ring,
  f being additiveFAF FrForm of V,W, v being Vector of V holds
  f.(v,0.W) = 0.INT.Ring
  proof
    let V, W be right_zeroed non empty ModuleStr over INT.Ring;
    let f be additiveFAF FrForm of V,W, v be Vector of V;
    f.(v,0.W) = f.(v,0.W+0.W) by RLVECT_1:def 4
    .= f.(v,0.W) + f.(v,0.W) by HTh27;
    hence thesis;
  end;
