Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Note on the Majorana-Oppenheimer Quantum Electrodynamics   A group theoretical description of the Majorana-Oppenheimer quantum
electrodynamics is considered. Different spinor realizations of the Maxwell and
Dirac fields are discussed. A representation of the Majorana-Oppenheimer wave
equations in terms of the Gel'fand-Yaglom formalism is given.

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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex