Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density Functional Theory for Field Theorists I   I summarize Density Functional Theory (DFT) in a language familiar to quantum
field theorists, and introduce several apparently novel ideas for constructing
{\it systematic} approximations for the density functional. I also note that,
at least within the large $K$ approximation ($K$ is the number of electron spin
components), it is easier to compute the quantum effective action of the
Coulomb photon field, which is related to the density functional by algebraic
manipulations in momentum space.

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The categories of this paper are: ao-sci
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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: stat
11
The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
1
The categories of this paper are: cs
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The categories of this paper are: mtrl-th