Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Approximation of Classification and Measures of Uncertainty in Rough Set
  on Two Universal Sets   The notion of rough set captures indiscernibility of elements in a set. But,
in many real life situations, an information system establishes the relation
between different universes. This gave the extension of rough set on single
universal set to rough set on two universal sets. In this paper, we introduce
approximation of classifications and measures of uncertainty basing upon rough
set on two universal sets employing the knowledge due to binary relations.

23
The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex