Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum temporal logic and decoherence functionals in the histories
  approach to generalised quantum theory   We analyse and develop the recent suggestion that a temporal form of quantum
logic provides the natural mathematical framework within which to discuss the
proposal by Gell-Mann and Hartle for a generalised form of quantum theory based
on the ideas of histories and decoherence functionals. Particular stress is
placed on properties of the space of decoherence functionals, including one way
in which certain global and topological properties of a classical system are
reflected in a quantum history theory.

35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio