  We study paramagnetic - ferromagnetic transition due to exchange interaction
between classical localized magnetic moments and conduction electrons. By
solving the Dynamical Mean Field Approximation equations we find explicit
formula for the transition temperature $T_c$ for arbitrary electron dispersion
law, concentration and re lation between exchange coupling and the electron
band width. We present the results of calculations of the $T_c$ for the
semi-circular electron density of states.
