Multiset concepts in two-universe approximation spaces

Multiset concepts in two-universe approximation spaces

Blog Article

Abstract Rough set theory over two universes is a generalization of rough set model to find accurate approximations for uncertain concepts in information systems in which uncertainty arises from existence of interrelations between the three basic sets: objects, attributes, and decisions.In this work, multisets are approximated in a crisp two-universe approximation space using binary ordinary relation and multi relation.The concept of graham c+ cream two universe approximation is applied for defining lower and upper approximations of multisets.Properties of these approximations are investigated, and the deviations between them and corresponding notions are obtained; some counter examples are given.The suggested notions can help in the modification of domeless quartz nails the decision-making for events in which objects have repetitions such as patients visiting a doctor more than one time; an example for this case is given.