Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Representations of almost periodic pseudodifferential operators and
  applications in spectral theory   The paper concerns algebras of almost periodic pseudodifferential operators
on $\mathbb R^d$ with symbols in H\"ormander classes. We study three
representations of such algebras, one of which was introduced by Coburn, Moyer
and Singer and the other two inspired by results in probability theory by
Gladyshev. Two of the representations are shown to be unitarily equivalent for
nonpositive order. We apply the results to spectral theory for almost periodic
pseudodifferential operators acting on $L^2$ and on the Besicovitch Hilbert
space of almost periodic functions.

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The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin