Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Schwinger Model in Point Form   We attempt to solve the Schwinger model, i.e. massless QED in 1+1 dimensions,
by quantizing it on a space-time hyperboloid x_\mu x^\mu =\tau^2. The
Fock-space representation of the 2-momentum operator is derived and its
algebraic structure is analyzed. We briefly outline a solution strategy.

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The categories of this paper are: math
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph