Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A strongly perturbed quantum system is a semiclassical system   We show that a strongly perturbed quantum system, being a semiclassical
system characterized by the Wigner-Kirkwood expansion for the propagator, has
the same expansion for the eigenvalues as for the WKB series. The perturbation
series is rederived by the duality principle in perturbation theory.

17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas