Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The maximal discrete extension of $SL_2(\mathcal{\scriptstyle{O}}_K)$
  for an imaginary-quadratic number field $K$   Let $\mathcal{\scriptstyle{O}}_K$ be the ring of integers of an imaginary
quadratic number field $K$. In this paper we give a new description of the
maximal discrete extension of the group $SL_2(\mathcal{\scriptstyle{O}}_K)$
inside $SL_2(\mathbb{C})$, which uses generalized Atkin-Lehner involutions.
Moreover we find a natural characterization of this group in $SO(1,3)$.

31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc