Belief Contraction in Dynamic Epistemic Logic
Dynamic epistemic logic represents belief change via model transformations induced by epistemic events. Its standard formulation (Baltag, Moss, Solecki, 1998) provides a natural account of belief expansion through the elimination of possibilities, but it cannot model belief contraction about factual propositions. A classic response enriches Kripke models with plausibility orderings, representing contraction as an update that promotes certain possibilities over others. We show that this approach has expressive limitations. In particular, the approach cannot model belief that violates positive introspection and contraction dynamics in response to a hedged public announcement that phi might ...
| Authors | Gaia Belardinelli, Snow Zhang |
|---|---|
| Primary category | cs.LO |
| Published | 30 June 2026 |
| Last updated at source | 30 June 2026 |
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