2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/25560The papaer shows how the known, exact results for the two electron bound states can modify the ground state phase diagram of extended Hubbard model (EHM) for on-site attraction, intersite repulsion and arbitrary electron density. The main result is suppression of the superconducting state in favor of normal phase for small charge densities.4 pages, 2 figures. Accepted for publication in physica status solidi (b) (C) (2004) WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimSuperconductivityStrongly Correlated Electronstext