Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On astigmatic solutions of the wave and the Klein-Gordon-Fock equations
  with exponential fall--off   Highly localized explicit solutions to multidimensional wave and
Klein--Gordon--Fock equations are presented. Their Fourier transform is also
found explicitly. Solutions depend on a set of parameters, and demonstrate
astigmatic properties. Asymptotic analysis for large and moderate time shows
that constructed solutions have Gaussian localisation near a point moving with
the group speed.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys