I have a problem which s related to this symmetric propety.
Show that there exist a unique set such that for all . The set is obviously the empty set. But then how do I prove the uniqueness part of , i.e. if and , then = the empty set
I have yet another simmilar problem.
Suppose are sets. Show that there exist a unique set such that . If are disjoint, then . But if not, then what would C have to be?