Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Existence of the solution to electromagnetic wave scattering problem for
  an impedance body of an arbitrary shape   A new proof is given of the existence of the solution to electromagnetic (EM)
wave scattering problem for an impedance body of an arbitrary shape. The proof
is based on the elliptic systems theory and elliptic estimates for the
solutions of such systems.

26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org