Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-real zeros of linear differential polynomials in real meromorphic
  functions   It is shown that if $f$ or $1/f$ is a real entire function of infinite order
of growth, with only real zeros, then $f''+\omega f$ has infinitely many
non-real zeros for any $\omega > 0$.

8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ