Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: THE DYSON-SCHWINGER EQUATION FOR A MODEL WITH INSTANTONS - THE SCHWINGER
  MODEL   Using the exact path integral solution of the Schwinger model -- a model
where instantons are present -- the Dyson-Schwinger equation is shown to hold
by explicit computation. It turns out that the Dyson-Schwinger equation
separately holds for every instanton sector. This is due to Theta-invariance of
the Schwinger model.

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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg