reserve X for BCI-algebra;
reserve x,y,z,u,a,b for Element of X;
reserve IT for non empty Subset of X;

theorem Th34:
  for x being Element of X holds x` in AtomSet(X)
proof
  let x be Element of X;
  0.X in AtomSet(X) by Th23;
  hence thesis by Th33;
end;
