Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Defining the electromagnetic potentials"   In this comment it is argued that the argument for a unique determination of
the electromagnetic potentials in classical electrodynamics in [1] is flawed.
To the contrary the "gauge freedom" of the electromagnetic potentials has
proven as one of the most important properties in the development of modern
physics, where local gauge invariance with its extension to non-Abelian gauge
groups is a key feature in the formulation of the Standard Model of elementary
particles in terms of a relativistic quantum field theory. [1] A. Davis, Eur.
J. Phys. 41, 045202 (2020)

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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom