Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical Duality Symmetries in Two Dimensions   Many two-dimensional classical field theories have hidden symmetries that
form an infinite-dimensional algebra. For those examples that correspond to
effective descriptions of compactified superstring theories, the duality group
is expected to be a large discrete subgroup of the hidden symmetry group. With
this motivation, we explore the hidden symmetries of principal chiral models
and symmetric space models.

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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: chao-dyn
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
2
The categories of this paper are: math
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci