Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On coincidence of Alday-Maldacena-regularized $\sigma$-model and
  Nambu-Goto areas of minimal surfaces   For the $\sigma$-model and Nambu-Goto actions, values of the
Alday-Maldacena-regularized actions are calculated on solutions of the
equations of motion with constant non-regularized Lagrangian. It turns out that
these values coincide up to a factor, independent of boundary conditions.

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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph