  In 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).
