  Formal but exact DC conductivity formulae for anisotropic Fermi liquids are
reviewed. One is the Maebashi-Fukuyama formula based on the Fermi-surface
harmonics. The other is the Taylor formula based on the scattering
eigenfunction. In comparison to these two formulae the
current-vertex-correction in the fluctuation-exchange approximation is shown to
be a bad vision caused by an inconsistent approximation.
