Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Basics of thermal field theory -- a tutorial on perturbative
  computations   These lecture notes, suitable for a two-semester introductory course or
self-study, offer an elementary and self-contained exposition of the basic
tools and concepts that are encountered in practical computations in
perturbative thermal field theory. Selected applications to heavy ion collision
physics and cosmology are outlined in the last chapter.

25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat