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On Some Issues in the Foundation of Rough Sets : the Problem of Definition

Chakraborty M. K.

Fundamenta Informaticae

2016

Vol. 148, nr 1/2

123--132

This paper is concerned with some issues connected with the foundations of rough set theory. Particularly the problem of definition of a rough set is discussed.

A Modal Logic for Indiscernibility and Complementarity in Information Systems

Balbiani P., Vakarelov D.

Fundamenta Informaticae

2002

Vol. 50, nr 3,4

243-263

In this paper, we study indiscernibility relations and complementarity relations in information systems. The first-order characterization of indiscernibility and complementarity is obtained through a duality result between information systems and certain structures of relational type characterized by first-order conditions. The modal analysis of indiscernibility and complementarity is performed through a modal logic which modalities correspond to indiscernibility relations and complementarity relations in information systems.