Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extension of von Neumann's uniqueness theorem to the theories with
  non-physical particles   Von Neumann's uniqueness theorem is extended to a special class of canonical
commutation relations, namely the anti-Fock representations, which are realized
on a Krein space.

4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
19
The categories of this paper are: eess
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th