A t-norm embedding theorem for fuzzy sets

  • Authors:
  • J. Bielawski;J. Tabor

  • Affiliations:
  • Faculty of Mathematics and Computer Science, Jagiellonian University, ul. ojasiewicza 6, 30-348 Kraków, Poland;Faculty of Mathematics and Computer Science, Jagiellonian University, ul. ojasiewicza 6, 30-348 Kraków, Poland

  • Venue:
  • Fuzzy Sets and Systems
  • Year:
  • 2012

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Abstract

It is well-known that the class of upper semicontinuous normal convex fuzzy sets with compact supports can be embedded isometrically as a complete convex cone in a Banach space. We prove an analogous result for a subclass of fuzzy sets that is free from the normality limitation by exchanging the standard algebraic operations on fuzzy sets with operations based on strict t-norms. This allows us to investigate a new notion of fuzzy convexity that we call T-convexity. We show that the class of upper semicontinuous fuzzy T-convex sets with nonempty compact supports can be embedded as a closed convex cone in a Banach space. This implies that fuzzy T-convex sets satisfy the cancellation law. We discuss a possible application of the embedding theorem in mathematical morphology.