Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Group graded endomorphism algebras and Morita equivalences   We prove a group graded Morita equivalences version of the "butterfly
theorem" on character triples. This gives a method to construct an equivalence
between block extensions from another related equivalence.

27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: econ
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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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: atom-ph
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio