Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elliptic problems in Besov and Sobolev-Triebel-Lizorkin spaces of low
  regularity   Elliptic problems with additional unknown distributions in boundary
conditions are investigated in Besov and Sobolev-Triebel-Lizorkin spaces of low
regularity, specifically of an arbitrary negative order. We find that the
problems induce Fredholm bounded operators on appropriate pairs of these
spaces.

9
The categories of this paper are: nlin
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an