<p>Rough set theory uses the concept of upper and lower approximations to encapsulate inherent inconsistency in real-world objects. Information multisystems are represented using multisets instead of crisp sets. This paper begins with an overview of recent works on multisets and rough sets. Rough multiset is introduced in terms of lower and upper approximations and explores related properties. The paper concludes with an example of certain types of information multisystems. Copyright © 2011 K. P. Girish and Sunil Jacob John.</p>
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K. Pa Girish and John, SbJacob, “Rough multisets and information multisystems”, Advances in Decision Sciences, vol. 2011, 2011.