Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Connection Between Wave Functions in the Dirac and Foldy-Wouthuysen
  Representations   The connection between wave functions in the Dirac and Foldy-Wouthuysen
representations is found. When the Foldy-Wouthuysen transformation is exact,
upper spinors in two representations differ only by constant factors, and lower
spinors in the Foldy-Wouthuysen representation are equal to zero.

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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph