Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical unknowables   A variety of physical unknowables are discussed. Provable lack of physical
omniscience, omnipredictability and omnipotence is derived by reduction to
problems which are known to be recursively unsolvable. "Chaotic" symbolic
dynamical systems are unstable with respect to variations of initial states.
Quantum unknowables include the random occurrence of single events,
complementarity and value indefiniteness.

24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an