Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Free Field Representation of Quantum Affine Algebra U_q(\hat{sl}_2)   A Fock representation of the quantum affine algebra $U_q(\widehat{\sl}_2)$ is
constructed by three bosonic fields for an arbitrary level with the help of the
Drinfeld realization.

24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg