Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Virtual Photon Structure Functions   We discuss the perturbatively calculable virtual photon structure functions.
First we present the framework for analyzing the structure functions of the
virtual photon and derive a first moment of $g_1^\gamma$ of the virtual photon.
We then investigate the three positivity constraints satisfied by the eight
structure functions of the virtual photon.

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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th