The difference (subtraction) of sets A and B (A - B) is the set of all elements that are in set A and not in set B. Subtraction is not commutative, meaning A - B != B - A.
The difference (subtraction) of sets A and B (A - B) is the set of all elements that are in set A and not in set B. Subtraction is not commutative, meaning A - B != B - A.