theorem BLTh29:
  for V, W being right_zeroed non empty ModuleStr over INT.Ring,
  f being additiveFAF Form of V,W,
  v being Vector of V holds f.(v,0.W) = 0
  proof
    let V, W be right_zeroed non empty ModuleStr over INT.Ring;
    let f be additiveFAF Form 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 BLTh27;
    hence thesis;
  end;
