Common truth ≠ uncertain information in public

what is Common truth ?

   ⑴ if picture A exist 
   ⑵ picture A shows event A exist
   ⑶ if picture A = true => event A = true

uncertain information in public

pattern 1⃣

   ⑴ if picture E not exist 
   ⑵ player E watches event E happens
   ⑶ if player E says event E = true => event E = true

pattern 2⃣

   ⑴ player E watches event E happens
   ⑵ player G take photo of other event G
   ⑶ if picture of event E not exist, 
       event G have more probability than event E

point:

   when there are 2 possible past world A & C, 
   remaining public information certificate more possible world