Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Addendum to "The Dirac-Coulomb Sturmians and the series expansion of the
  Dirac-Coulomb Green function: application to the relativistic polarizability
  of the hydrogen-like atom" [J. Phys. B: At. Mol. Opt. Phys. 30 (1997) 825-61,
  (E) 30 (1997) 2747]   Closure relations satisfied by the radial Dirac-Coulomb Sturmians are proved
analytically. The Sturmian expansion of the Dirac-Coulomb Green function is
transformed to the form containing only series with summations running over
non-negative indices. The main paper was published in J. Phys. B: At. Mol. Opt.
Phys. 30 (1997) 825-61 [Erratum: 30 (1997) 2747], see also J. Phys. A: Math.
Gen. 31 (1998) 4963--90 [Erratum: 31 (1998) 7415-6].

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The categories of this paper are: acc-phys
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
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The categories of this paper are: econ
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-fin