Vagueness and Uncertainty: A Rough Set Perspective

Vagueness and uncertainty have attracted attention of philosophers and logicians for many years. Recently AI researchers contributed essentially to this area of research. Fuzzy set theory and the theory of evidence are seemingly the most appealing ones. In this note we present a new outlook on these problems, based on the rough set theory-which seems to be a very suitable mathematical tool to deal with these problems. The paper is a modiied version of the authors talk entitled "An inquiry into vagueness and uncertainty", which was delivered on the AI Conference in Wigry (Poland), 1995.