If I truthfully say ‘a kowhai tree has yellow flowers’ to a group of friends, that fact is then commonly known among them. This indeed works for propositions about facts, such as in the example, but it is a mistaken intuition that whatever you announce is thereafter commonly known: it does not hold for certain epistemic propositions.
KeywordsCommon Knowledge Epistemic State Epistemic Logic Public Announcement Logical Language
Unable to display preview. Download preview PDF.