Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Special monodromy groups and Riemann-Hilbert problem for Riemann
  equation   In the present work we use the Levelt's valuation theory to describe all
monodromy representations that can be realized by Riemann equation. Also we
show that if the monodromy of Riemann equation lies in $SL(2,\mathbb{C})$, then
such a monodromy can be realized by a more special Riemann-Sturm-Liouville
equation as well. After all the criterion for hypergeometric equation to have
monodromy in $SL(2,\mathbb{Z})$ is presented.

13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom