Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffusion limit for the radiative transfer equation perturbed by a
  Wiener process   The aim of this paper is the rigorous derivation of a stochastic non-linear
diffusion equation from a radiative transfer equation perturbed with a random
noise. The proof of the convergence relies on a formal Hilbert expansion and
the estimation of the remainder. The Hilbert expansion has to be done up to
order 3 to overcome some diffculties caused by the random noise.

3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys