Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetries of 2nd order ODE: y'' + G(x)y' + H(x)y = 0   This paper is devoted to study the Lie algebra of linear symmetries of a
homogenous 2nd order ODE, by the method of Kushner, Lychagin and Robstov.

28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga