Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of Uniform Rectilinear Motion of Charged Shell in Sommerfeld
  Model with Self-Action   It is proved that in classical electrodynamics the uniform rectilinear motion
of charged "rigid" sphere with self-action (Sommerfeld model) is stable.

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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph