Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: LanHEP - a package for automatic generation of Feynman rules in field
  theory. Version 2.0   The LanHEP program for Feynman rules generation in momentum representation is
presented. It reads the Lagrangian written in a compact form, close to the one
used in publications. It means that Lagrangian terms can be written with
summation over indices of broken symmetries and using special symbols for
complicated expressions, such as covariant derivative and strength tensor for
gauge fields. The output is Feynman rules in terms of physical fields and
independent parameters. This output can be written in LaTeX format and in the
form of CompHEP model files, which allows one to start calculations of
processes in the new physical model. Although this job is rather
straightforward and can be done manually, it requires careful calculations and
in modern theories with many particles and vertices, such as supersymmetric
models, can lead to errors and misprints. The program allows one to introduce
into CompHEP new gauge theories as well as various anomalous terms.

32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex