theorem Th11:
  0.V in Z_Lin(A)
proof
  reconsider l = ZeroLC(V) as Linear_Combination of A by RLVECT_2:22;
A1: Sum(l) = 0.V by RLVECT_2:30;
  rng l c= INT by Th7;
  hence thesis by A1;
end;
