  We show that the quantum disk, i.e. the quantum space corresponding to the
Toeplitz C*-algebra does not admit any compact quantum group structure. We
prove that if such a structure existed the resulting compact quantum group
would simultaneously be of Kac type and not of Kac type. The main tools used in
the solution come from the theory of type I locally compact quantum groups, but
also from the theory of operators on Hilbert spaces.
