  We investigate the Hall effect and the magnetoresistance of strongly
correlated electron systems using the dynamical mean-field theory. We treat the
low- and high-temperature limits analytically and explore some aspects of the
intermediate-temperature regime numerically. We observe that a
bipartite-lattice condition is responsible for the high-temperature result
$\sigma_{xy}\sim 1/T^2$ obtained by various authors, whereas the general
behavior is $\sigma_{xy}\sim 1/T$, as for the longitudinal conductivity. We
find that Kohler's rule is neither obeyed at high nor at intermediate
temperatures.
