Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Selectors for sequences of subsets of hyperspaces   For a Hausdorff space $X$ we denote be $2^X$ the family of all closed subsets
of $X$. In this paper we continue to research relationships between closure
-type properties of hyperspaces over a space $X$ and covering properties of
$X$. We investigate selectors for sequence of subsets of the space $2^{X}$ with
the $Z^{+}$-topology and the upper Fell topology.

9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs