Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On universal Severi varieties of low genus K3 surfaces   We prove the irreducibility of universal Severi varieties parametrizing
irreducible, reduced, nodal hyperplane sections of primitive K3 surfaces of
genus g, with 3 \le g \le 11, g \neq 10.

18
The categories of this paper are: econ
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph