  A particular Fermi-point-splitting (FPS) model is proposed, which allows, for
finite values of the three-momentum, the group and phase velocities of the
muon-flavor neutrino in vacuum to be superluminal (i.e., muon-neutrino
velocities greater than c, the velocity of light in vacuum). Still, the
proposed FPS model has a front velocity equal to c for all particles, which is
known to be crucial for causality. If the muon-neutrino velocity is indeed
superluminal as claimed by OPERA, the model predicts that at least one of the
other two flavors of neutrinos has a subluminal velocity.
