Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Effect of Positivity Constraints on Polarized Parton Densities   The impact of positivity constraints on the polarized parton densities has
been studied. Special attention has been paid to the role of positivity
constraints in determining the polarized strange quark and gluon densities,
which are not well determined from the present data on inclusive polarized DIS.

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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn