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.