Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ergodicity for singular-degenerate porous media equations   The long time behaviour of solutions to generalised stochastic porous media
equations on bounded domains with Dirichlet boundary data is studied. We focus
on a degenerate form of nonlinearity arising in self-organised criticality.
Based on the so-called lower-bound method, the existence and uniqueness of an
invariant measure is proved.

6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn