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 …

The knowledge discovery process is as old as Homo sapiens. Until some time ago this
process was solely based on the 'natural personal'computer provided by Mother Nature …

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The two-volume set of proceedings of IJCRS 2017, the 2017 International Joint Conference
on Rough Sets, contains the results of the meeting of the International Rough Set Society …

The aim of this paper is to give rudiments of rough set theory and present some recent
research directions proposed by the author. Rough set theory is a new mathematical …

Since its introduction by George Boole during the mid-1800s, Boolean algebra has become
an important part of the lingua franca of mathematics, science, engineering, and research in …

A variety of cluster analysis techniques exist to group objects having similar characteristics.
However, the implementation of many of these techniques is challenging due to the fact that …

We consider approximate versions of fundamental notions of theories of rough sets and
association rules. We analyze the complexity of searching for α-reducts, understood as …

The research monograph is devoted to the study of bounds on time complexity in the worst
case of decision trees and algorithms for decision tree construction. The monograph is …

In this paper we revise the notion of decision bireducts. We show new interpretations and we
prove several important and practically useful facts regarding this notion. We also explain …