Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massless Three Dimensional Quantum Electrodynamics and Thirring Model
  Constrained by Large Flavor Number   We explicitly prove that in three dimensional massless quantum
electrodynamics at finite temperature, zero density and large number of flavors
the number of infrared degrees of freedom is never larger than the
corresponding number of ultraviolet. Such a result, strongly dependent on the
asymptotic freedom of the theory, is reversed in three dimensional Thirring
model due to the positive derivative of its running coupling constant.

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The categories of this paper are: physics
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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: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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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: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: math-ph