Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On a family of strongly regular graphs with \lambda=1   In this paper, we give a complete description of strongly regular graphs with
parameters ((n^2+3n-1)^2,n^2(n+3),1,n(n+1)). All possible such graphs are: the
lattice graph $L_{3,3}$ with parameters (9,4,1,2), the Brouwer-Haemers graph
with parameters (81,20,1,6), and the Games graph with parameters
(729,112,1,20).

34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg