Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On a differential operator with absent spectrum   In this paper, we consider spectral problem for the nth order ordinary
differential operator with degenerate boundary conditions. We construct a
nontrivial example of boundary value problem which has no eigenvalues.

22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th