Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Equation of state for the one-dimensional attractive \delta-potential
  Bose gas in the weak-coupling regime   Approximated formulae for real quasi-momentum and the associated energy
spectrum are presented for one-dimensional Bose gas with weak attractive
contact interactions. On the basis of the energy spectrum, we obtain the
equation of state in the high temperature region, which is found to be the van
der Waals equation without volume correction.

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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: cs