Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conditional observability   For a quantum Hamiltonian H =H(p) the observability of the energies E may be
robust (whenever all E are real at all p) or, otherwise, conditional. Using a
pseudo-Hermitian family of N-state chain models H we discuss some generic
properties of conditionally observable spectra.

31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org