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(2010) Synthese 172 (1).

S5 knowledge without partitions

Dov Samet

pp. 145-155

We study set algebras with an operator (SAO) that satisfy the axioms of S5 knowledge. A necessary and sufficient condition is given for such SAOs that the knowledge operator is defined by a partition of the state space. SAOs are constructed for which the condition fails to hold. We conclude that no logic singles out the partitional SAOs among all SAOs.

Publication details

DOI: 10.1007/s11229-009-9469-0

Full citation:

Samet, D. (2010). S5 knowledge without partitions. Synthese 172 (1), pp. 145-155.

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