2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27130We obtain the exact solution of a general Hubbard chain with kinetic energy $t$, bond-charge interaction $X$ and on-site interaction $U$ with the only restriction $t = X$. At zero temperature and half filling, the model exhibits a Mott transition at $U = 4t$. In the metallic phase and near half filling, superconducting states are part of the degenerate ground state and are favored for small $U$ if the system is slightly perturbed.10 pages, no figures, LATEX, CNEA-CAB 3305Condensed Mattertext