Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reformulating String Theory with the $1/N$ Expansion   We argue that string theory should have a formulation for which stability and
causality are evident. Rather than regard strings as fundamental objects, we
suggest they should be regarded as composite systems of more fundamental
point-like objects. A tentative scheme for such a reinterpretation is described
along the lines of 't Hooft's $1/N$ expansion and the light-cone
parametrization of the string.

21
The categories of this paper are: adap-org
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph