Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Normal CR structures on compact 3-manifolds   We study normal CR compact manifolds in dimension 3. For a choice of a CR
Reeb vector field, we associate a Sasakian metric on them, and we classify
those metrics. As a consequence, the underlying manifolds are topologically
finite quotiens of the 3-sphere or of a circle bundle over a Riemann surface of
positive genus. In the latter case, we prove that their CR automorphisms group
is a finite extension of U(1), and we classify the normal CR structures on
these manifolds.

14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org