Superconductivity from purely repulsive forces?

The old problem raised by Kohn and Luttinger is revisited: Will purely repulsive forces due to screening effects lead to effective attraction in the vicinity of the Fermi surface for finite angular momentum channels? If so, superconductivity could be generated from purely repulsive forces. This problem has been discussed recently by several groups and it was argued that the l = 1 channel was most favorable. Contrary to these claims it will be argued by this author that the effective interaction remains repulsive: the normal Fermi liquid remains stable against superconductivity! (C) 1995 American Institute of Physics.