Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A short note on the counting complexity of conjunctive queries   This note closes a minor gap in the literature on the counting complexity of
conjunctive queries by showing that queries that are not free-connex do not
have a linear time counting algorithm under standard complexity assumptions.
More generally, it is shown that the so-called quantified star size is a lower
bound for the exponent in the runtime of any counting algorithm for conjunctive
queries.

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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
2
The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: econ