Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The elliptic genus of Calabi-Yau 3- and 4-folds, product formulae and
  generalized Kac-Moody algebras   In this paper the elliptic genus for a general Calabi-Yau fourfold is
derived. The recent work of Kawai calculating N=2 heterotic string one-loop
threshold corrections with a Wilson line turned on is extended to a similar
computation where K3 is replaced by a general Calabi-Yau 3- or 4-fold. In all
cases there seems to be a generalized Kac-Moody algebra involved, whose
denominator formula appears in the result.

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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
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The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th