2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/29610In this short write-up we argue that self-consistent diagrammatic perturbation theory(i.e. Feynman diagrams) for the one-particle Green function is unable to capture some important qualitative features no matter how self-consistently the Green functions are obtained. This write-up is intended to highlight the short-comings of perturbation theory and also tout the advantages of the sea-boson technique(hep-th/9706006).3 pages, RevTexCondensed Mattertext