Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A compact manifold with holonomy Spin(7) from Beauville's Calabi-Yau
  fourfold   We give a new example of a compact manifold with holonomy Spin(7) from a
Beauville's Calabi-Yau fourfold. Its construction is very concrete, starting
with products of elliptic curves with complex multiplications --- so probably
more accessible to physicists.

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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph