Iterative and fixed point common belief

Journal of Philosophical Logic 28 (1):61-79 (1999)
We define infinitary extensions to classical epistemic logic systems, and add also a common belief modality, axiomatized in a finitary, fixed-point manner. In the infinitary K system, common belief turns to be provably equivalent to the conjunction of all the finite levels of mutual belief. In contrast, in the infinitary monotonic system, common belief implies every transfinite level of mutual belief but is never implied by it. We conclude that the fixed-point notion of common belief is more powerful than the iterative notion of common belief
Keywords common knowledge  common belief  infinitary logic
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DOI 10.1023/A:1004357300525
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References found in this work BETA
Ronald Fagin (1994). A Quantitative Analysis of Modal Logic. Journal of Symbolic Logic 59 (1):209-252.
Luc Lismont (1993). La Connaissance Commune En Logique Modale. Mathematical Logic Quarterly 39 (1):115-130.

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