Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: (1,9)-spacetime --> (1,3)-spacetime: Reduction => U(1)xSU(2)xSU(3)   A derivation of the standard symmetry and leptoquark family structure is
presented that is more straightforward than a previous derivation.

31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc