Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical cancellation of photon quadratic divergence in the study of
  the Schwinger-Dyson equations in Strong Coupling QED   The behaviour of the photon renormalization function in strong coupling QED
has been recently studied by Kondo, Mino and Nakatani. We find that the sharp
decrease in its behaviour at intermediate photon momenta is an artefact of the
method used to remove the quadratic divergence in the vacuum polarization. We
discuss how this can be avoided in numerical studies of the Schwinger-Dyson
equations.

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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an