Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A closed-form solution in a dynamical system related to Bianchi IX   The Bianchi IX cosmological model in vacuum can be represented by several
six-dimensional dynamical systems. In one of them we present a new closed form
solution expressed by a third Painleve' function.

13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph