Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Automorphism Group of $NU(3,q^2)$   Let $H(n, q^2)$ be a non-degenerate Hermitian variety of $PG(n,q^2)$, $n \geq
2$. Let $NU(n+1,q^2)$ be the graph whose vertices are the points of $PG(n,q^2)
\setminus H(n,q^2)$ and two vertices $u,~v$ are adjacent if the line joining
$u$ and $v$ is tangent to $H(n, q^2 )$. Then $NU(n + 1, q^2)$ is a strongly
regular graph. In this paper we show that the automorphism group of the graph
$NU(3,q^2)$ is isomorphic either to $P\Gamma U(3,q)$, the automorphism group of
the projective unitary group $PGU(3,q)$, or to $S_{3} \wr S_{4}$, according as
$q \neq 2$, or $q=2$.

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The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
6
The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin