Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: c=2 Rational Toroidal Conformal Field Theories via the Gauss Product   We find a concise relation between the moduli $\tau, \rho$ of a rational
Narain lattice $\Gamma(\tau,\rho)$ and the corresponding momentum lattices of
left and right chiral algebras via the Gauss product. As a byproduct, we find
an identity which counts the cardinality of a certain double coset space
defined for isometries between the discriminant forms of rank two lattices.

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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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: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int