PPT Slide
 
 
Let agent1 send a message j to agent2 that reaches him with a time delay e. The maximum J of the delay is common knowledge.
- A message j is sent at t0 . 
- At t1 < t2 +J  the message arrives, t0 is known to the receiver. 
- At t2 = t0 +J  both parties know that j must have been received and
- j has now become common knowledge.