Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral Singularities of a General Point Interaction   We study the problem of locating spectral singularities of a general complex
point interaction with a support at a single point. We also determine the bound
states, examine the special cases where the point interaction is P-, T-, and
PT-symmetric, and explore the issue of the coalescence of spectral
singularities and bound states.

27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg