Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin 1/2 Particle Dynamics Near Reissner-Nordstrom Black Holes: Extremal
  and Non-Extremal Cases   In this work, the fermion behaviour near the Reissner-Nordstrom black holes
in quantum mechanics is studied and exact solutions of the Dirac equation for
Reissner-Nordstrom Black Holes are obtained in terms of special functions. We
have obtained different vector potentials which satisfy the solutions.

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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
18
The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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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: atom-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: nlin