Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rough sets and three-valued structures   In recent years, many papers have been published showing relationships
between rough sets and some lattice theoretical structures. We present here
some strong relations between rough sets and three-valued {\L}ukasiewicz
algebras.

30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph