Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some exceptional extensions of Virasoro vertex operator algebras   In this paper, extensions of nonunitary rational Virasoro vertex operator
algebras corresponding to some exceptional modular invariants are constructed.
The uniqueness of these extensions is also established.

37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs