  We present a simple density functional theory for the solid phases of systems
of particles interacting via soft-core potentials. In particular, we apply the
theory to particles interacting via repulsive point Yukawa and Gaussian pair
potentials. We find qualitative agreement with the established phase diagrams
for these systems. The theory is able to account for the bcc-fcc solid
transitions of both systems and the re-entrant melting that the Gaussian system
exhibits.
