Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Closed Geodesics on Ellipsoids   Closed geodesic lines on an ellipsoid in d-dimensional Euclidean space are
considered. Explicit algebro-geometric condition for closedness of such a
geodesic is given. The obtained condition is discussed in light of
theta-functions theory and compared with some recent related results.

30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org