The title of this note announces an attempt at pointing to particular points where rough set and fuzzy set approaches to decision making are close to each other, the closeness meaning that formal approaches to behaviour of the two at those points can be given in an analogous form. This by no means implies that the two can be unified as theories deal ing with uncertainty. As the notion of truth for rough set decision rules is well established, we pr opose a notion of truth for fuzzy decision rules and we seek an analogy between the two. In order to introduce an analogous form of graded notion of truth for decision rules in both theories, we intro duce a new context in which to set this notion. This context is based on our earlier results concern ing rough mereological granular logics and their relevance for rough decision rules. To make our exposition satisfactorily complete, we recall our approach to granularity based on rough mereology.
['Lech Polkowski', 'Maria Semeniuk-Polkowska']
Where Rough Sets and Fuzzy Sets Meet