Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Understanding Quantum Theory   There exist dozens of interpretations of quantum theory, but they do not seem
to contribute much to understanding the theory. This paper attempts to clarify
some issues that are discussed in those interpretations. The main keywords are:
"Classical ontology", Indeterminism, Probability, Predictions, The necessity of
classical concepts, Minimal interpretation, Lattice, Physical objects,
Alternatives to quantum theory?, Measurement, Realism. One of the main points
of this paper is the role of predictions in understanding any theory of
physics.

24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol