Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Yet another construction of the central extension of the loop group   We give a characterisation of central extensions of a Lie group G by the
non-zero complex numbers in terms of a differential two-form on G and a
differential one-form on GxG. This is applied to the case of the central
extension of the loop group.

10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess