Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: On the `Irreducible' Freedman-Townsend Vertex   An irreducible cohomological derivation of the Freedman-Townsend vertex in
four dimensions is given.

23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph