Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Why (inner) bars are important but not sufficient   I briefly report on the work conducted to probe the gravitational potential
of active and non-active disk galaxies using two-dimensional gas and stellar
kinematics, first emphasizing the need to make a distinction between ''fuelling
the nucleus'' and ''building a gas reservoir''.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph