Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Short Presentations for Aut$_n^+$ and Out$_n^+$   This paper uses the methods from arXiv:0804.1396 to give 'short'
presentations for Aut$^+(F_n)$, the special automorphism group of the free
group of rank $n$, and Out $^+(F_n)$ the special outer automorphism group of
the free group of rank $n$.

5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con