Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Morita equivalence classes of principal blocks with elementary abelian
  defect groups of order 64   We classify the Morita equivalence classes of principal blocks with
elementary abelian defect groups of order 64 with respect to a complete
discrete valuation ring with an algebraically closed residue field of
characteristic two.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an