Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Capacity Region of Multiple Access Channel   The capacity region of a multiple access channel is discussed. It was found
that orthogonal multiple access and non orthogonal multiple access have the
same capacity region under the constraint of same sum power.

33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph