Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The fundamental group of symplectic $4$-manifolds with $b^+=1$   In this article we apply the technique of Luttinger surgery to study the
complexity of the fundamental group of symplectic $4$-manifolds with
holomorphic Euler number $\chi_h=1$. We discuss the topology of symplectic
$4$-manifolds with $b^+=1$ and provide various constructions of symplectic
$4$-manifolds with $b^+=1$ and prescribed $c_1^2$.

29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess