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Unawareness : A Formal Theory of Unforeseen Contingencies. Part II


  • MODICA, Salvatore

    (CORE, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium and Università di Palermo)


    (CORE, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium and Università di Palermo)


In this paper we conclude the research initiated in Modica and Rustichini [6]. We claim here, as we did in that paper, that simple uncertainty is not an adequate model of a subject's ignorance, because a major component of it is the inability to give a complete description of the states of the world, and we provide a formal model of unawareness. In Modica and Rustichini [6j we showed a difficulty in the project, in that without a weakening of the inference rules of the logic one would face the unpleasant alternative between full awareness and full unawareness. We give a formal definition of unawareness, we study a system of modal logic where non full awareness is possible, and prove that a satisfactory solution to the problem can be found by introducing limited reasoning ability of the subject.

Suggested Citation

  • MODICA, Salvatore & RUSTICHINI, Aldo, 1994. "Unawareness : A Formal Theory of Unforeseen Contingencies. Part II," CORE Discussion Papers 1994004, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  • Handle: RePEc:cor:louvco:1994004

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    Cited by:

    1. Dekel, Eddie & Lipman, Barton L. & Rustichini, Aldo, 1998. "Recent developments in modeling unforeseen contingencies," European Economic Review, Elsevier, vol. 42(3-5), pages 523-542, May.
    2. Zimper, Alexander, 2009. "An epistemic model of an agent who does not reflect on reasoning processes," Mathematical Social Sciences, Elsevier, vol. 58(3), pages 290-309, November.

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