Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A spherical CR structure on the complement of the figure eight knot with
  discrete holonomy   We describe a general geometrical construction of spherical CR structures. We
construct then spherical CR structures on the complement of the figure eight
knot and the Whitehead link. They have discrete holonomies contained in
$PU(2,1,{\bf Z}[\omega])$ and $PU(2,1,{\bf Z}[i])$ respectively. These are the
same ring of integers appearing in the real hyperbolic geometry of the
corresponding links.

18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci