reserve V for non empty set,
  A,B,A9,B9 for Element of V;
reserve f,f9 for Element of Funcs(V);
reserve m,m1,m2,m3,m9 for Element of Maps V;
reserve a,b for Object of Ens(V);
reserve f,g,f1,f2 for Morphism of Ens(V);

theorem
  for W being Universe, a being Object of Ens(W) st a is terminal ex x
  being set st a = {x}
proof
  let W be Universe, a be Object of Ens(W);
  now
A1: {{}} in W by CLASSES2:56,57;
    assume W = {{}};
    hence contradiction by A1;
  end;
  hence thesis by Th33;
end;
