Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Twistor lines on cubic surfaces   It is shown that there exist non-singular cubic surfaces in CP^3 containing 5
twistor lines. This is the maximum number of twistor fibres that a non-singular
cubic can contain. Cubic surfaces in CP^3 with 5 twistor lines are classified
up to transformations preserving the conformal structure of S^4.

1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin