NONPERTURBATIVE GROUND-STATE OF A GENERALIZED HUBBARD-MODEL

A generalized Hubbard model with on-site interaction U, inter-site int eraction V, and general correlated hopping. is studied using a mapping method. An exact solution of the problem of one hole and one doubly-o ccupied site moving in a ferromagnetic spin background is obtained. Th e mapping method used is based on mapping the original many-body probl em onto an equivalent tight-binding one with impurities in a higher di mensional space.