reserve x1,x2,z for set;
reserve A,B for non empty set;
reserve f,g,h for Element of Funcs(A,COMPLEX);

theorem
  ComplexFuncZero(A) <> ComplexFuncUnit(A)
proof
  set a = the Element of A;
  (ComplexFuncZero(A)).a=0c by FUNCOP_1:7;
  hence thesis by COMPLEX1:def 4,FUNCOP_1:7;
end;
