A rapid growth of interest in rough set theory [297] and its applications can be lately seen in
the number of international workshops, conferences and seminars that are either directly …

Since introduction of the theory of rough set in early eighties, considerable work has been
done on the development and application of this new theory. The paper provides a review of …

Worldwide, there has been a rapid growth in interest in rough set theory and its applications
in recent years. Evidence of this can be found in the increasing number of high-quality …

Abstract Information granulation and concept approximation are some of the fundamental
issues of granular computing. Granulation of a universe involves grouping of similar …

The theory of rough sets is an extension of set theory with two additional unary set-theoretic
operators defined based on a binary relation on the universe. These two operators are …

This paper presents a general framework for the study of rough set approximation operators
in fuzzy environment in which both constructive and axiomatic approaches are used. In …

When possible worlds semantics arrived around 1960, one of its most charming features
was the discovery of simple connections between existing intensional axioms and ordinary …

Since Pawlak [43] proposed the rough set theory in early eighties, many proposals have
been made for generalizing and interpreting rough sets [3, 4, 19, 27, 37, 38, 39, 46, 47, 51 …

The calculus of relations has been an important component of the development of logic and
algebra since the middle of the nineteenth century, when Augustus De Morgan observed …

Set-valued information systems are generalized models of single-valued information
systems. In this paper, we propose two new relations for set-valued information systems …