Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the fundamental group of complete manifolds with almost Euclidean
  volume growth   It is proved that the fundamental group of a complete Riemannian manifold
with nonnegative Ricci curvature and certain volume growth conditions is
trivial or finite.

30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess