Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: On traces and modified Fredholm determinants for half-line Schr\"odinger
  operators with purely discrete spectra
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
19
The categories of this paper are: eess
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an