Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simple Models of Quasihomogeneous Projective 3-Folds   Let X be a projective complex 3-fold, quasihomogeneous with respect to an
action of a linear algebraic group. We show that X is a compactification of
SL_2/G, G a discrete subgroup, or that X can be equivariantly transformed into
the 3-dim. projective space, the quadric Q_3, or into certain quasihomogeneous
bundles with very simple structure.

15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph