Abstract
The slave-boson functional-integral approach to the Hubbard model by Kotliar and Ruckenstein is applied to the spin-degenerate Anderson impurity model. At T=0 a simple saddle-point approximation to the functional integral is shown to be equivalent to a special case of a variational ansatz presented by the author in the 1970's. The question of how to choose the freedom in the form of the hopping Hamiltonian in the enlarged Hilbert space including the slave bosons is discussed.
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