Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some surfaces with non-polyhedral nef cones   We study the nef cones of complex smooth projective surfaces and give a
sufficient criterion for them to be non-polyhedral. We use this to show that
the nef cone of C x C, where C is a complex smooth projective curve of genus at
least 2, is not polyhedral.

37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
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
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th