set f = the carrier of X --> (0. Y);
reconsider f = the carrier of X --> (0. Y) as LinearOperator of X,Y by Th23;
for x being VECTOR of X holds f . x = 0. Y by FUNCOP_1:7;
then f is bounded by Th25;
hence not BoundedLinearOperators (X,Y) is empty by Def10; :: thesis: verum