Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Real-Space Renormalization Group Applied to Diffusion in
  Inhomogeneous Media   The real-space renormalization group technique is introduced to evaluate the
effective diffusion constant for diffusion in inhomogeneous media, which has
been obtained by singular perturbation methods. Our method is formulated on a
discretized real space and hence it can be easily combined with numerical
studies for partial differential equations.

6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th