Introspective forgetting

Synthese 169 (2):405-423 (2009)
We model the forgetting of propositional variables in a modal logical context where agents become ignorant and are aware of each others’ or their own resulting ignorance. The resulting logic is sound and complete. It can be compared to variable-forgetting as abstraction from information, wherein agents become unaware of certain variables: by employing elementary results for bisimulation, it follows that beliefs not involving the forgotten atom(s) remain true.
Keywords Modal logic  Forgetting  Abstraction  Action logic  Belief change
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DOI 10.1007/s11229-009-9554-4
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Hans van Ditmarsch & Tim French (2014). Semantics for Knowledge and Change of Awareness. Journal of Logic, Language and Information 23 (2):169-195.

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