Information Processing and Management of Uncertainty in Knowledge-Based Systems

Volume 444 of the series Communications in Computer and Information Science pp 406-415

The X-μ Approach: In Theory and Practice

  • Daniel J. LewisAffiliated withIntelligent Systems Laboratory, University of Bristol
  • , Trevor P. MartinAffiliated withIntelligent Systems Laboratory, University of Bristol

* Final gross prices may vary according to local VAT.

Get Access


Criticisms exist for fuzzy set theory which do not reside in classical (or “crisp”) set theory, some such issues exhibited by fuzzy set theory regard the law of excluded middle and law of contradiction. There are also additional complexities in fuzzy set theory for monotonicity, order and cardinality. Fuzzy set applications either avoid these issues, or use them to their advantage. The X-μ approach, however, attempts to solve some of these issues through analysis of inverse fuzzy membership functions. Through the inverse fuzzy membership function it is possible to computationally calculate classical set operations over an entire fuzzy membership. This paper firstly explores how the X-μ approach compares to both classical/crisp set theory and conventional fuzzy set theory, and explores how the problems regarding the laws of excluded middle and contradiction might be solved using X-μ. Finally the approach is implemented and applied to an area of big data over the world-wide-web, using movie ratings data.