Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enumeration of Seidel matrices   In this paper Seidel matrices are studied, and their spectrum and several
related algebraic properties are determined for order $n\leq 13$. Based on this
Seidel matrices with exactly three distinct eigenvalues of order $n\leq 23$ are
classified. One consequence of the computational results is that the maximum
number of equiangular lines in $\mathbb{R}^{12}$ with common angle $1/5$ is
exactly $20$.

35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph