Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Postulates and Experimental Features in Maxwell's Electromagnetic
  Equations   The Maxwell integral equations expressing Ampere's and Faraday's laws are
shown to be affected by heavy physical approximations. The usual deduction from
them, moreover, of the corresponding set of differential Maxwell equations is
based, in general, on a wrong use of the Stokes theorem. The equivalence,
therefore, between the two sets of equations must be reconsidered. Interesting
conclusions may be drawn from the comparison between the experimental set-ups
of the Faraday's law and of the Aharonov-Bohm effect.

20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex