Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How Is Nature Asymmetric ? 1. Discrete Symmetries in Particle Physics
  and Parity Violation   This two-part article considers certain fundamental symmetries of nature,
namely the discrete symmetries of parity (P), charge conjugation (C) and time
reversal (T), and their possible violation. Recent experimental results are
discussed in some depth. In the first part of this article we present a general
background and discuss parity violation.

26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph