
theorem Th9:
  CLSStruct (# the_set_of_l2ComplexSequences, Zero_(
    the_set_of_l2ComplexSequences,Linear_Space_of_ComplexSequences), Add_(
    the_set_of_l2ComplexSequences,Linear_Space_of_ComplexSequences), Mult_(
    the_set_of_l2ComplexSequences,Linear_Space_of_ComplexSequences) #) is
  ComplexLinearSpace by Th6;
