Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Free Energy of Hot QED at Three and Half Loops   The computation of order $e^4$ and $e^5$ contributions to the pressure of
massless quantum electrodynamics at a temperature $T$ is overviewed.

18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
10
The categories of this paper are: q-bio