For example, Existential Difference between World states relates to differences between world states where certain Objects exist. Given a world state from agent A's perspective where it has either 8 or 10 dollars, Existential Difference is defined as the minus (-) operator, and results in W($10, A) - W($8, A) = W($2, A). A converse operator can be applied using addition (+).
Add logical operators within world states.
For example, Existential Difference between World states relates to differences between world states where certain Objects exist. Given a world state from agent A's perspective where it has either 8 or 10 dollars, Existential Difference is defined as the minus (-) operator, and results in W($10, A) - W($8, A) = W($2, A). A converse operator can be applied using addition (+).