Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Equation of state for hard square lattice gases   A simple equation of state for a lattice gas of hard squares of side length
$\lambda$ is presented. Comparing to the Monte Carlo simulations, the new
equation of state is found to be quite accurate for the disordered fluid phase.

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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: q-fin