It is shown that the ground state of the symmetric one-dimensional periodic Anderson model on a bipartite lattice with periodic boundary conditions is a pseudospin singlet and has total momentum equal to zero. \textcopyright{} 1996 The American Physical Society.
Exact solutions of the Hubbard model and the periodic Anderson model in the limit of infinite interaction strength are presented. Both models are studied on a D-dimensional decorated hypercubic lattice with periodic boundary conditions for any dimension D\ensuremath{\ge}2 and arbitrary size. The lattice is very similar to the perovskite lattice. In addition to the ground-state energy, a corresponding eigenstate is constructed. This ground state contains at least two particles per unit cell. For the Anderson model, the exact solution is restricted to a surface in the (Ef,V) parameter space; however, the resulting relation V(Ef) does not lead to unphysical parameters.