Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sieve in expansion   This is a survey report for the Bourbaki Seminar (Exp. no. 1028, November
2010) concerning sieve and expanders, in particular the recent works of
Bourgain, Gamburd and Sarnak introducing "sieve in orbits", and the related
developments concerning expansion properties of Cayley graphs of finite linear
groups.

20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc