In the framework of the recently proposed electroweak theory on a Planck
lattice, we are able to solve approximately the lattice Dyson equation for the
fermion self-energy functions, and obtain the ratio between the masses of the
t− and b− quarks in terms of the electroweak coupling constants. The
predicted top mass agrees with recent determinations from electroweak
observables.Comment: To appear in Phys. Lett. B, 8 pages + 3 figure