Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rationalit\'e d'un fibr\'e en coniques   F. Campana had asked whether a certain threefold is rational. In
arXiv:1310.3569v1 [mathAG], this variety was shown to be birational to a
specific conic bundle and then to be unirational. We prove that this conic
bundle is rational.

6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con