Abstract
The low-frequency portion of electrical conductivity in a disordered quantum system with the mirror symmetry is examined. The system is described by the Hubbard Hamiltonian, and the number of electrons is assumed to be equal to the number of sites. It is demonstrated that, given the strong attraction of electrons residing at the same site and the strong repulsion of electrons at the neighboring sites, the conductivity of the system at T=0 increases with its size. It is shown that the metal-insulator transition does not occur in such a system.
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