Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on: "Harmonic oscillator in an environment with a pointlike
  defect". Phys. Scr. \textbf{94} ( 2019) 125301   We analyze recent results for a harmonic oscillator in an environment with a
pointlike defect. We show that the allowed oscillator frequencies predicted by
the authors stem from a misinterpretation of the exact solutions of a
conditionally solvable eigenvalue equation. Also the exact eigenvalues derived
by those authors are meaningless because they belong to different
quantum-mechanical models.

25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph