Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Comparisons for Local Quantities of the Two-Dimensional Hubbard
  Model   We have compared the results of our approximation scheme, the composite
operator method, for the double occupancy and the internal energy of the
two-dimensional Hubbard model with numerical data obtained by means of the
Lanczos and quantum Monte Carlo schemes. The agreement is very good at both
half-filling and away from it showing how reliable is the approximation scheme.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: stat
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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: physics
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex