Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Remarks on Gauge-Invariant Variables and Interaction Energy in QED   The calculation of the interaction energy in pure QED and
Maxwell-Chern-Simons gauge theory is re-examined by exploiting the path
dependence of the gauge-invariant variables formalism. In particular, we
consider a spacelike straight line which leads to the Poincar\'{e} gauge.
Subtleties related to the problem of exhibiting explicitly the interaction
energies are illustrated.

34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
1
The categories of this paper are: cs