Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: String theory: a perspective over the last 25 years   This article provides some historical background and then reviews
developments in string theory over the last twenty-five years or so. Both
perturbative and non-perturbative approaches to string theory are surveyed and
their impact on how we view quantum gravity is analysed.

31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat