
theorem
  for L being Z_Lattice, v being Vector of L,
      l being Linear_Combination of {}(the carrier of L)
  holds SumSc(v, l) = 0.F_Real
  proof
    let L be Z_Lattice, v be Vector of L,
        l be Linear_Combination of {}(the carrier of L);
    l = ZeroLC(L) by VECTSP_6:6;
    hence thesis by LmSumSc11;
  end;
