Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An entropic characterization of the flat metrics on the two torus   The geodesic flow of the flat metric on a torus is minimizing the polynomial
entropy among all geodesic flows on this torus. We prove here that this
properties characterises the flat metric on the two torus.

17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio