Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the left invariant Randers and Matsumoto metrics of Berwald type on
  3-dimensional Lie groups   In this paper we identify all simply connected 3-dimensional real Lie groups
which admit Randers or Matsumoto metrics of Berwald type with a certain
underlying left invariant Riemannian metric. Then we give their flag curvatures
formulas explicitly.

13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess