2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17886The theory of hole superconductivity proposes that MgB_2, and the high Tc cuprates, and the 'conventional superconductors', and all other superconductors, are driven by the same physical mechanism, which is not the electron-phonon interaction. That mechanism, hole undressing, evidence supporting it, and predictions for MgB_2, are briefly reviewed.To be published in "Studies of High Temperature Superconductors", ed. by A. Narlikar, Nova Sci. Pub., New YorkSuperconductivityStrongly Correlated Electronstext