Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: DJKM algebras I: Their Universal Central Extension   The purpose of this paper is to explicitly describe in terms of generators
and relations the universal central extension of the infinite dimensional Lie
algebra, $\mathfrak g\otimes \mathbb C[t,t^{-1},u|u^2=(t^2-b^2)(t^2-c^2)]$,
appearing in the work of Date, Jimbo, Kashiwara and Miwa in their study of
integrable systems arising from Landau-Lifshitz differential equation.

34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph