Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Automorphisms and cohomology of discrete groups   In this paper we describe a method for producing elements in the mod p
cohomology of a discrete group of finite cohomological dimension.
  This provides a purely algebraic formulation of the theory of special cycles.

32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga