
theorem
  RLSStruct(# the_set_of_l2RealSequences, Zero_(
    the_set_of_l2RealSequences,Linear_Space_of_RealSequences), Add_(
    the_set_of_l2RealSequences,Linear_Space_of_RealSequences), Mult_(
    the_set_of_l2RealSequences,Linear_Space_of_RealSequences) #) is Subspace of
  Linear_Space_of_RealSequences by Th4;
