Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chain varieties of monoids   A variety of universal algebras is called a chain variety if its subvariety
lattice is a chain. Non-group chain varieties of semigroups were completely
classified by Sukhanov in 1982. Here we completely determine non-group chain
varieties of monoids as algebras of tyoe (2,0).

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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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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: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga