Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determination of a wave field in a laterally inhomogeneous medium from
  boundary data   We deal with the Cauchy problem for a perturbed wave equation in the
half-plane with data given on a part of the space-time boundary. The equation
in consideration describes a wave process in a laterally inhomogeneous medium.
We propose a reconstruction algorithm, which is applicable to the problem of
determining nonstationary wave field from boundary data arising in geophysics.

24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin