Multiset concepts in two-universe approximation spaces

Multiset concepts in two-universe approximation spaces

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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 read more are approximated in a crisp two-universe approximation space using binary ordinary relation and multi relation.The concept of two universe approximation is applied for defining lower and upper approximations g35 coupe fender 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 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.