On the "non-perturbative analysis" of zero-temperature dephasing: I.   Dyson equation and self energy
  We point out that the structure of the self-energy suggested in cond-mat/0208140 as a result of a ``non-perturbative analysis'' by ``purely mathematical means'' is incompatible with the very definition of the self-energy. 
I.L. Aleiner, B.L. Altshuler, M.G. Vavilov