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In his preprint, arXiv:0711.0952v1, Behnam Farid argues that the Luttingertheorem is valid not only for a metal but also for a Mott insulator if thechemical potential is calculated by taking the limit of vanishing temperatureat fixed particle density. In contrast, we have found in our recent paper (Eur.Phys. J. B 59, 495 (2007) or arXiv:cond-mat/0602656) on the basis of acontrolled strong coupling expansion that the Luttinger theorem is violated inthis limit for a particle-hole asymmetric two-band Mott insulator. In anextensive discussion of our result Farid argues that an arbitrarily weakbreaking of particle-hole symmetry leads to a destruction of the Mottinsulating state at half filling. In this comment we point out that this is notcorrect.

Comment on `On the Luttinger theorem concerning the number of particles  in the ground states of systems of interacting fermions', arXiv:0711.0952v1,  by B. Farid