Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Liouville Theory and SL(2,R) Symmetry   The Liouville action emerges as the effective action of 2-d gravity in the
process of path integral quantization of the bosonic string. It yields a
measure of the violation of classical symmetries of the theory at the quantum
level. Certain aspects of the residual SL(2,R) invariance of the gauge-fixed
Liouville theory are disscussed. ( Lectures presented at the Danube Workshop
'93,
  June 1993, Belgrade, Yugoslavia.)

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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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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: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: quant-ph