Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic addition of perpendicular velocity components from the
  constancy of the speed of light   Mermin [Am. J. Phys. {\bf 51}, 1130--1131 (1983)] derived the relativistic
addition of the parallel components of velocity using the constancy of the
speed of light. In this note, the derivation is extended to the perpendicular
components of velocity.

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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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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-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: eess