Before revision: In decision theory, the sure-thing principle states that a decision maker who would take a certain action if he knew that event E has occurred, and also if he knew that the negation of E has occurred, should also take that same action if he knows nothing about E. The principle was coined by L.J.
After revision: In decision theory, the sure-thing principle states that a decision maker who would take a certain action in the case that event E has occurred, as well as in the case that the negation of E has occurred, should also take that same action if they knowdecided they nothing about E. The principle was coined by L.J.