Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positivity bounds on parton distributions at large N_c   Positivity bounds for twist-two parton distributions in multicolored QCD are
stronger than their analogs at finite $N_c$. They include the enhanced large
$N_{c}$ version of Soffer inequality. These bounds are compatible with the
DGLAP evolution to higher normalization points.

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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: math-ph