Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Abelian class groups of reductive group schemes   We introduce the abelian class group C_{ab}(G) of a reductive group scheme G
over a ring A of arithmetical interest and study some of its properties. In
particular, we show that if the fraction field of A is a global field without
real primes, then there exists a surjection C(G)-->> C_{ab}(G), where C(G) is
the class set of G.

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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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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: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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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: hep-lat
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The categories of this paper are: econ