Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: W-Algebras Extending Affine gl(1|1)   It was recently shown that gl^(1|1) admits an infinite family of simple
current extensions. Here, these findings are reviewed and explicit free field
realisations of the extended algebras are constructed. The leading
contributions to the operator product algebra are then calculated. Among these
extensions, one finds four infinite families that seem to contain, as
subalgebras, copies of the W^(2)_N algebras of Feigin and Semikhatov at various
levels and central charges +/- 1.

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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
3
The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th