  In the framework of dynamical mean field theory (DMFT) we analyze Hall effect
in doped Mott insulator as a parent cuprate superconductor. We consider the
partial filling (hole doping) of the lower Hubbard band and calculate the
dependence of Hall coefficient and Hall number on hole doping, determining the
critical concentration for sign change of the Hall coefficient. Significant
temperature dependence of Hall effect is noted. A good agreement is
demonstrated with concentration dependence of Hall number obtained in
experiments in the normal state of YBCO.
