Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An improvement to a result about graph isomorphism networks using the
  prime factorization theorem   The unique prime factorization theorem is used to show the existence of a
function on a countable set $\mathcal{X}$ so that the sum aggregator function
is injective on all multisets of $\mathcal{X}$ of finite size.

34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph