In set theory, the symmetric difference of two sets A and B is the set of elements which appear in exactly one of A or B. In other words, it is the union of A and B minus their intersection. This operator is both commutative and associative. It is usually represented by an uppercase delta.

For example, consider the set of positive even numbers, and the set of positive multiples of 3. The symmetric difference of these two sets is the set {2, 3, 4, 8, 9, 10, 14, 15, 16, ...}

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