Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the First Trace Formula for Schr\"odinger Operators   We prove that the so-called first trace formula holds for all Schr\"odinger
operators on the line with real-valued integrable potentials.

21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph