Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Riemannian foliations on contractible manifolds   We prove that Riemannian foliations on complete contractible manifolds have a
closed leaf, and that all leaves are closed if one closed leaf has a finitely
generated fundamental group. Under additional topological or geometric
assumptions we prove that the foliation is also simple.

25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph