Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Filters and Ultrafilters as Approximate Solutions in the Attainability
  Problems with Constrains of Asymptotic Character   Problems about attainability in topological spaces are considered. Some
nonsequential version of the Warga approximate solutions is investigated: we
use filters and ultrafilters of measurable spaces. Attraction sets are
constructed.

7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat