Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On resolvent approximations of elliptic differential operators with
  periodic coefficients   We study resolvent approximations for elliptic differential nonselfadjoint
operators with periodic coefficients in the limit of the small period. The
class of operators covered by our analysis includes uniformly elliptic families
with bounded coefficients and also with unbounded coefficients from the
John-Nirenberg space $BMO$ (bounded mean oscillation). We apply the modified
method of the first approximation with the usage of Steklov's smoothing.

31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga