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Involution (mathematics)

Function that is its own inverse / From Wikipedia, the free encyclopedia

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In mathematics, an involution, involutory function, or self-inverse function[1] is a function f that is its own inverse,

f(f(x)) = x
An involution is a function that, when applied twice, brings one back to the starting point.

for all x in the domain of f.[2] Equivalently, applying f twice produces the original value.