Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Lie-Algebraic Approach To the Kondo Problem   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 $N$.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph