Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Functional approach to quantum decoherence and the classical final limit
  II: the pointer basis and the quantum measurements   A quantum system with discrete and continuos evolution spectrum is studied. A
final pointer basis is found, that can be defined in a presised mathematical
way. This result is use to explain the quantum measurement in the system.

31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th