Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Closed orbits for the diagonal group and well-rounded lattices   Curt McMullen showed that every compact orbit for the action of the diagonal
group on the space of lattices contains a well-rounded lattice. We extend this
to all closed orbits.

28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio