Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An introduction to the Kepler-Heisenberg problem   Here we provide an overview of what is known, and what is not known, about an
interesting dynamical system known as the Kepler-Heisenberg problem. The main
idea is to pose a version of the classical Kepler problem of planetary motion,
but in a sub-Riemannian setting. The result is system which is surprisingly
rich and beautiful, mysterious in some ways but tame in others, offering a
substantial number of questions which seem non-trivial yet tractable.

22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat