Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: W Algebras, W Gravities and their Moduli Spaces   By generalizing the Drinfel'd--Sokolov reduction we construct a large class
of W algebras as reductions of Kac--Moody algebras. Furthermore we construct
actions, invariant under local left and right W transformations, which are the
classical covariant induced actions for W gravity. Talk presented by T. Tjin at
the Trieste Summerschool on strings and related topics.

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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: math