theorem
  for X,Y be ComplexNormSpace holds CLSStruct (# BoundedLinearOperators(
X,Y), Zero_(BoundedLinearOperators(X,Y), C_VectorSpace_of_LinearOperators(X,Y))
    , Add_(BoundedLinearOperators(X,Y), C_VectorSpace_of_LinearOperators(X,Y)),
Mult_(BoundedLinearOperators(X,Y),C_VectorSpace_of_LinearOperators(X,Y)) #) is
  Subspace of C_VectorSpace_of_LinearOperators(X,Y) by Th21,CSSPACE:11;
