Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-Dimensional Chiral Matrix Models and String Theories   We formulate and solve a class of two-dimensional matrix gauge models
describing ensembles of non-folding surfaces covering an oriented, discretized,
two-dimensional manifold. We interpret the models as string theories
characterized by a set of coupling constants associated to worldsheet
ramification points of various orders. Our approach is closely related to, but
simpler than, the string theory describing two-dimensional Yang-Mills theory.
Using recently developed character expansion methods we exactly solve the
models for target space lattices of arbitrary internal connectivity and
topology.

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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc