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In set theory, the symmetric difference of two sets A and B is the set of elements either in A or in B but not in both.

Definition

Given two sets A and B,
$A \Delta B = \{ x|x \in A \oplus x \in B \}$

## Example

Suppose A = {1,3,5,7,9} and B = {1,2,3,4,5}:

$A \Delta B = \{ 2,4,7,9 \}$