Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Skew polynomial rings over abelian and idempotent reflexive rings   Let $R$ be a ring and $\sigma$ an endomorphism of $R$. In this note, we study
skew polynomial rings and skew power series rings over idempotent reflexive
rings and abelian rings. Also, we introduce the concept of right (resp., left)
$\sigma$-idempotent reflexive rings which generalizes right (resp., left)
idempotent reflexive rings and $\sigma$-abelian rings. Certain results are
obtained as corollaries from our results.

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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph