Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Expanding Ricci solitons with pinched Ricci curvature   In this paper, we prove that expanding gradient Ricci solitons with
(positively) pinched Ricci curvature are trivial ones. Namely, they are either
compact or flat.

5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio