Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crossed Bimodules over Rings and Shukla Cohomology   In this paper we present some applications of Ann-category theory to
classification of crossed bimodules over rings, classification of ring
extensions of the type of a crossed bimodule.

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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat