Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long strings in two dimensional string theory and non-singlets in the
  matrix model   We consider two dimensional string backgrounds. We discuss the physics of
long strings that come from infinity. These are related to non-singlets in the
dual matrix model description.

18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio