Abstract
The Kondo problem is studied using the unitary Lie algebra of spin-singlet
fermion bilinears. In the limit when the number of values of the
spin $N$ goes to infinity the theory approaches a classical limit,
which still requires a renormalization. We determine the ground state
of this renormalized theory. Then we construct a quantum theory around
this classical limit, which amounts to recovering the case of finite
$N$.
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