Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Birational geometry of the moduli space of pure sheaves on quadric
  surface   We study birational geometry of the moduli space of stable sheaves on a
quadric surface with Hilbert polynomial $5m + 1$ and $c_{1} = (2, 3)$. We
describe a birational map between the moduli space and a projective bundle over
a Grassmannian as a composition of smooth blow-ups/downs.

5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs