Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Introduction to BRS symmetry   This paper contains a revised version of the lecture notes of a short course
on the quantization of gauge theories. Starting from a sketchy review of
scattering theory, the paper describes the lines of BRST-Faddeev-Popov
quantization considering the problem of a non-perturbative extension of this
method. The connection between Slavnov-Taylor identity and S-matrix unitarity
is also discussed.

11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom