Common_Knowledgeについて、ここに記述してください。
https://plato.stanford.edu/entries/common-knowledge/
Knowledge and the Flow of Information (The David Hume Series) (English Edition)
1. mutual knowledge
https://en.wikipedia.org/wiki/Mutual_knowledge_(logic)
https://en.wikipedia.org/wiki/The_Emperor%27s_New_Clothes
"The Emperor's New Clothes" (Danish: Kejserens nye klæder [ˈkʰɑjsɐns ˈnyˀə ˈkʰleːɐ̯])
https://www.sciencedirect.com/science/article/abs/pii/S0378216699001289