Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on the Background Independent Open String Theory   A direct derivation of the string field theory action in the Witten's
background independent open string theory for the case when ghosts and matter
are decoupled is given and consequences are discussed.

34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom