Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum statistics of ideal gases in confined space   In this paper, the effects of boundary and connectivity on ideal gases in
two-dimensional confined space and three-dimensional tubes are discussed in
detail based on the analytical result. The implication of such effects on the
mesoscopic system is also revealed.

27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci