Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absence of eigenvalues for integro-differential operators with periodic
  coefficients   Applying perturbation theory methods, the absence of the point spectrum for
some nonselfadjoint integro-differential operators is investigated. The
considered differential operators are of arbitrary order and act in either
$\mathbf{L}_{p}(\mathbb{R}_{+})$ or $\mathbf{L}_{p}(\mathbb{R}) (1\leq
p<\infty)$. As an application of general results, new spectral properties of
the perturbed Hill operator are derived.

10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga