Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The contact process seen from a typical infected site   This paper studies contact processes on general countable groups. It is shown
that any such contact process has a well-defined exponential growth rate, and
this quantity is used to study the process. In particular, it is proved that on
any nonamenable group, the critical contact process dies out.

9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas