Witsenhausen’s counterexample

from the Wikipedia article on this topic:
“The counterexample lies at the intersection of control theory and information theory.”

“The problem is of conceptual significance in decentralized control because it shows that it is important for the controllers to communicate with each other implicitly in order to minimize the cost. This suggests that control actions in decentralized control may have a dual role: those of control and communication.”
Here is the link to the full article.
keywords: Electronics, Electrical Engineering