Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Hartree-Fock equations of the electron/positron field   We study the energy of relativistic electrons and positrons interacting via
the second quantized Coulomb potential in the field of a nucleus of charge Z
within the Hartree-Fock approximation. We show that the associated functional
has a minimizer. In addition, all minimizers are purely electronic states, they
are projections, and fulfill the no-pair Dirac-Fock equations.

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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
18
The categories of this paper are: econ
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs