It is well known that such a polarization wavefunction will not have a proper permutation symmetry. How can the exchange effects and the Pauli exclusion principle be incorporated into the presented theory? To restore the proper permutation symmetry, we use weak symmetry forcing, according to the procedure known from the symmetrized Rayleigh-Schrödinger (SRS) approach. It relies on projecting the polarization wavefunction onto the subspace of functions with correct symmetry by using the antisymmetrizer operator A . Introducing it into the Eq. ( ) yields