An Interpretation of Belief Functions on Infinite Universes in the Theory of Rough Sets

  • Authors:
  • Wei-Zhi Wu;Ju-Sheng Mi

  • Affiliations:
  • School of Mathematics, Physics and Information Science, Zhejiang Ocean University, Zhoushan, Zhejiang, P.R. China 316004;College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang, Hebei, P.R. China 050016

  • Venue:
  • RSCTC '08 Proceedings of the 6th International Conference on Rough Sets and Current Trends in Computing
  • Year:
  • 2008

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Abstract

A general type of belief structure and its inducing dual pair of belief and plausibility functions on infinite universes of discourse are first defined. Relationship between belief and plausibility functions in Dempser-Shafer theory of evidence and the lower and upper approximations in rough set theory is then established. It is shown that the probabilities of lower and upper approximations induced by an approximation space yield a dual pair of belief and plausibility functions. And for any belief structure there must exist a probability approximation space such that the belief and plausibility functions defined by the given belief structure are just respectively the lower and upper probabilities induced by the approximation space. Finally, essential properties of the belief and plausibility functions are examined. The belief and plausibility functions are respective a monotone Choquet capacity and an alternating Choquet capacity of infinite order.