Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Electronic Ground State Energy Problem: a New Reduced Density Matrix
  Approach   We present here a formulation of the electronic ground-state energy in terms
of the second order reduced density matrix, using a duality argument. It is
shown that the computation of the ground-state energy reduces to the search of
the projection of some two-electron reduced Hamiltonian on the dual cone of
$N$-representability conditions. Some numerical results validate the approach,
both for equilibrium geometries and for the dissociation curve of N$_2$.

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The categories of this paper are: hep-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: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat