Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On existence of real spectra in position dependent complex mass quantum
  systems   We argue that real spectra in physical system can exist with position
dependent complex mass under constraint.

0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th