Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Extremal N=2 Superconformal Field Theory   We provide an example of an extremal chiral ${\cal N}=2$ superconformal field
theory at $c=24$. The construction is based on a ${\mathbb Z}_2$ orbifold of
the theory associated to the $A_{1}^{24}$ Niemeier lattice. The statespace is
governed by representations of the sporadic group $M_{23}$.

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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
2
The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int