theorem
  for X,Y be ComplexLinearSpace holds CLSStruct (# LinearOperators(X,Y),
    Zero_(LinearOperators(X,Y),ComplexVectSpace(the carrier of X,Y)), Add_(
    LinearOperators(X,Y), ComplexVectSpace(the carrier of X,Y)), Mult_(
LinearOperators(X,Y), ComplexVectSpace(the carrier of X,Y)) #) is Subspace of
  ComplexVectSpace(the carrier of X,Y) by Th13,CSSPACE:11;
