EXACT SINGLE SPIN-FLIP FOR THE HUBBARD-MODEL IN D=INFINITY

It is shown that the dynamics of a single down arrow-electron interact ing with a band of up arrow-electrons can be calculated exactly in the limit of infinite dimension. The corresponding Green function is dete rmined as a continued fraction. It is used to investigate the stabilit y of saturated ferromagnetism and the nature of the ground state for t wo generic nonbipartite infinite dimensional lattices. Non-Fermi-liqui d behavior is found. For certain dopings the down arrow-electron is bo und to the up arrow-holes.