Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbit categories, classifying spaces, and generalized homotopy fixed
  points   We give a new description of Rosenthal's generalized homotopy fixed point
spaces as homotopy limits over the orbit category. This is achieved using a
simple categorical model for classifying spaces with respect to families of
subgroups.

24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
14
The categories of this paper are: math-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
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs