Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Birman-Schwinger principle in galactic dynamics   These are the (somewhat extended) lecture notes for four lectures delivered
at the spring school during the thematic programme "Mathematical Perspectives
of Gravitation beyond the Vacuum Regime" at ESI Vienna in February 2022.

17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ