Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple demonstration of Bell's theorem involving two observers and no
  probabilities or inequalities   This paper describes a device, consisting of a central source and two widely
separated detectors with six switch settings each, that provides a simple
gedanken demonstration of Bell's theorem without relying on either statistical
effects or the occurrence of rare events. The mechanism underlying the
operation of the device is revealed for readers with a knowledge of quantum
mechanics.

9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an