Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: KdV type systems and W-algebras in the Drinfeld-Sokolov approach   The generalized Drinfeld-Sokolov construction of KdV systems is reviewed in
the case of an arbitrary affine Lie algebra paying particular attention to
Hamiltonian aspects and $\W$-algebras. Some extensions of known results as well
as a new interpretation of the construction are also presented.

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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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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: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph