The energy spectrum of the two-sublattice Hubbard model is obtained in
the static-fluctuation approximation. It is shown how the structure o
f the energy spectrum is modified as the parameters of the Hubbard mod
el are varied. ?The ground state of the simple Hubbard model of dimens
ion d=2 is the dielectric antiferromagnetic state. The author derives
a consistency equation for the magnetization, which has an antiferroma
gnetic solution. (C) 1997 American Institute of Physics.