Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three manifolds as geometric branched coverings of the three sphere   One method for obtaining every closed orientable 3-manifold is as branched
covering of the 3-sphere over a link. There is a classical topological result
showing that the minimun possible number of sheets in the covering is three. In
this paper we obtain a geometric version of this result. The interest is given
by the growing importance of geometry in 3-manifolds theory.

36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph