Involution (mathematics)

Involution (mathematics)

In mathematics, an (anti-)involution, or an involutary function, is a function f that is its own inverse:

f(f(x)) = x for all x in the domain of f.

Read more about Involution (mathematics):  General Properties

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Involution (mathematics) - Involution Throughout The Fields of Mathematics - Computer Science
... The XOR bitwise operation with a given value for one parameter is also an involution ... XOR masks were once used to draw graphics on images in such a way that drawing them twice on the background reverts the background to its original state ...