Now showing items 1-5 of 5

  • Fuzzy approximation relations, modal structures and possibilistic logic 

    Esteva Massaguer, Francesc; Garcia, Pere; Godo Lacasa, Lluís; Rodríguez, Ricardo Óscar (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1998)
    Article
    Open Access
    The paper introduces a general axiomatic notion of approximation mapping, a mapping that associates to each crisp proposition p a fuzzy set representing "approximately p". It is shown how it can be obtained through fuzzy ...
  • Lexicographic combinations of preference relations in the context of possibilistic decision theory 

    Godo Lacasa, Lluís; Zapico, Adriana (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2006)
    Article
    Open Access
    In Possibilistic Decision Theory (PDT), decisions are ranked by a pressimistic or by an optimistic qualitative criteria. The preference relations induced by these criteria have been axiomatized by corresponding sets of ...
  • On fuzzy temporal constraint networks 

    Vila, Lluís; Godo Lacasa, Lluís (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1994)
    Article
    Open Access
    Temporal Constraint Networks are a well-defined, natural and efficient formalism for representing temporal knowledge based on metric temporal constraints. They support the representation of both metric and some qualitative ...
  • Putting together Łukasiewicz and product logics 

    Esteva Massaguer, Francesc; Godo Lacasa, Lluís (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    In this paper we investigate a propositional fuzzy logical system $\L\Pi$ which contains the well-known \L ukasiewicz, Product and G\"{o}del fuzzy logics as sublogics. We define the corresponding algebraic structures, ...
  • Using fuzzy similiarity relations to revise and update a knwoledge base 

    Rodríguez, Ricardo Óscar; Garcia, Pere; Godo Lacasa, Lluís (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1996)
    Article
    Open Access
    Similarity-based models were first used by Ruspini to give semantics to fuzzy logic ([7]). In these models, incomplete information is represented by an evidential set, i.e. a set of possible worlds that are compatible ...