R. Raghavan

Work place: SITE, VIT University, Vellore- 632014, Tamil Nadu, India

E-mail: rraghavan@vit.ac.in


Research Interests: Computer systems and computational processes, Computing Platform, Type Systems, Mathematics of Computing


R. Raghavan is an Assistant Professor (Senior) in the School of Information Technology and Engineering (SITE), VIT University, at Vellore, India. He is pursuing his M.S., (By Research) degree from the same school. He is a life member of CSI. His current research interest includes Rough Sets and Systems, knowledge engineering, Granular Computing, Intelligent Systems.

Author Articles
On Some Comparison Properties of Rough Sets Based on Multigranulations and Types of Multigranular Approximations of Classifications

By R. Raghavan B.K. Tripathy

DOI: https://doi.org/10.5815/ijisa.2013.06.09, Pub. Date: 8 May 2013

In this paper we consider the inclusion properties for upper and lower approximation of union and intersection of sets for both pessimistic and optimistic multigranulations. We find that two inclusions for pessimistic cases are actually equalities. For other six cases we provide examples to show that actually the proper inclusions hold true. On the approximation of classifications a theorem was proved in Tripathy et al to establish sufficient type properties. We establish here that actually the result is both necessary and sufficient one. Also, we consider types of elements in classifications with respect to both types of multigranulations and establish a general theorem on them.

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