Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the structure of sets which have coinciding representation functions   For a set of nonnegative integers $A$, denote by $R_{A}(n)$ the number of
unordered representations of the integer $n$ as the sum of two different terms
from $A$. In this paper we partially describe the structure of the sets, which
have coinciding representation functions.

33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga