Solutions of composite fuzzy relational equations with triangular norms

  • Authors:
  • Masaaki Miyakoshi;Masaru Shimbo

  • Affiliations:
  • -;-

  • Venue:
  • Fuzzy Sets and Systems
  • Year:
  • 1985

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Abstract

T-and @a"T-compositions, i.e., composite operations of sup-T and inf-@a"T, and relationships among -, @a"T-operators and t-norm are considered. It is shown that, if a composite fuzzy relational equation by T-composition has solutions, then a greatest one exists, and that if a similar equation by @a"T-composition has solutions, a greatest or least one exists, and unlike in T-compositions, it may have no lower solutions even if it has a greatest. Furthermore, the equivalence of the - and @a"T-operator, and the equipollence between t-norms and @a"T-operators are also shown. These results may be applicable to fuzzy inference under compositional rules of inference.