Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Overview of topological properties of real algebraic surfaces   These notes reproduce the content of a short, 50-minutes, survey talk given
at the Nice University in September, 2004. We added a few topics that have not
been touched on in the lecture by lack of time.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci