Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large relativistic corrections to the positronium decay rate   Relativistic corrections to the positronium decay rate are calculated. They
are close to $40(\alpha /\pi)^2$ and $46(\alpha /\pi)^2$ for singlet and
triplet states respectively.

34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas