Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $W_\infty$ Algebra and Geometric Formulation of QCD$_2$   We review the gauge invariant formulation of 2-dim. QCD. We show that the
non-linear gauge invariant phase space is the coset $W_\infty/W_{+\infty}\times
W_{-\infty}$ ,which is specified by the $N=\infty$ master-field of this model.
The meson fields correspond to the local coordinates of the coset. We comment
on the stringy collective coordinates of the solitons (baryons) in this model.

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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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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: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con