Preserving mappings in fuzzy predicate logics

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In this article, we develop the method of diagrams for fuzzy predicate logics and give a characterization of different kinds of preserving mappings in terms of diagrams. Our work is a contribution to the model-theoretic study of fuzzy predicate logics. We present a reduced semantics and we prove a completeness theorem of the logics with respect to this semantics. The main concepts being studied are the Leibniz congruence and the structure-preserving relation. On the one hand, the Leibniz congruence of a model identifies the elements that are indistinguishable using equality-free atomic formulas and parameters from the model. A reduced structure is the quotient of a model modulo this congruence. On the other hand, the structure-preserving relation between two structures plays the same role that the isomorphism relation plays in classical predicate languages with equality. © 2011 The Author.
Original languageEnglish
Pages (from-to)1367-1389
JournalJournal of Logic and Computation
Issue number6
Publication statusPublished - 1 Dec 2012


  • Fuzzy predicate logics
  • method of diagrams
  • model theory
  • reduced structures


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