Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The characterization of Hermitian surfaces by the number of points   The nonsingular Hermitian surface of degree $\sqrt{q} +1$ is characterized by
its number of $\Bbb{F}_q$-points among the irreducible surfaces over
$\Bbb{F}_q$ of degree $\sqrt{q} +1$ in the projective 3-space.

18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga