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  • Orderings of fuzzy sets based on fuzzy orderings. Part II: generalizations 

    Bodenhofer, Ulrich (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    In Part I of this series of papers, a general approach for ordering fuzzy sets with respect to fuzzy orderings was presented. Part I also highlighted three limitations of this approach. The present paper addresses these ...
  • A connection between computer science and fuzzy theory: midpoints and running time of computing 

    Casanovas, Jaume; Valero, O. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    Following the mathematical formalism introduced by M. Schellekens [Elec- tronic Notes in Theoret. Comput. Sci. 1 (1995), 211-232] in order to give a common foundation for Denotational Semantics and Complexity Analysis, we ...
  • Interval-valued fuzzy ideals generated by an interval-valued fuzzy subset in ordered semigroups 

    Shabir, M.; Israr, Ali Khan (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    In this paper, we de ne the concept of interval-valued fuzzy left (right, two sided, interior, bi-) ideal in ordered semigroups. We show that the interval- valued fuzzy subset J is an interval-valued fuzzy left (right, ...
  • Infinitary simultaneous recursion theorem 

    Vaggione, D. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    We prove an in nitary version of the Double Recursion Theorem of Smullyan. We give some applications which show how this form of the Recursion Theo- rem can be naturally applied to obtain interesting in nite sequences ...
  • A logic approach for exceptions and anomalies in association rules 

    Delgado, M.; Sánchez, Daniel; Ruiz, M.D. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    Association rules have been used for obtaining information hidden in a database. Recent researches have pointed out that simple associations are insu cient for representing the diverse kinds of knowledge collected in ...