Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of the Gauge Equivalent Classes in Inverse Stationary
  Transport in Refractive Media   In the inverse stationary transport problem through anisotropic attenuating,
scattering, and refractive media, the albedo operator stably determines the
gauge equivalent class of the attenuation and scattering coefficients.

15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga